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What is an Illegal Delivery in Cricket? – RULES EXPLAINED!

By CricketersChoice Editors

The actions of a bowler can lead to an illegal delivery in cricket. A bowler simply cannot bowl to the batsman in any way they wish.

Laws have been in place to prevent illegal bowling actions in cricket. These include underarm bowling and throwing the ball down towards the batsman. However, determining a legal delivery from a throw can be a confusing task for umpires. As a result, there are guidelines in place to support the officiating of illegal deliveries.

In world cricket, there have been some illegal deliveries that have caused controversy. Furthermore, certain players’ bowling styles have raised question marks over the rules about illegal deliveries. Such bowlers have been accused of generating more pace on their delivery by throwing rather than bowling.

Below, we will unpick all the types of illegal delivery in cricket and look back at some of the biggest bowling controversies seen in world cricket.

What is an illegal delivery in cricket?

Illegal deliveries can cover a range of actions by the bowler, resulting in a no-ball. The specifics on what constitutes a legal delivery are set by the Marylebone Cricket Club document, the Laws of CricketThe International Cricket Council also have guidance for players and officials on specific bowling actions. 

Below are the most common types of illegal deliveries in cricket. 

  1. Throwing (or chucking)

Throwing, also known as chucking in cricket, is when a bowler throws the ball towards the batsman. In the official laws of cricket, a throw comes from the elbow bending and releasing the ball without straightening the elbow upon follow through. 

In the Laws of Cricket, number 24, 3, states, “A ball is fairly delivered in respect to the arm if, once the bowler’s arm has reached the level of the shoulder in the delivery swing, the elbow joint is not straightened partially or completely from that point until the ball has left the hand.”

Some famous and very successful bowlers have faced scrutiny over their bowling actions that walk a tight line between legality and chucking. For example, Sri Lankan spinner Muttiah Muralitharan had a minor deformity that slightly bent his elbow when he was bowling. This led to close inspection from officials, but a slight bend in the elbow is permitted in the rules. 

Other players, such as Sri Lankan quick bowler Lasith Malinga, have a unique bowling style that appears similar to a throw at first. As a result, Malinga has faced scrutiny for chucking, as his technique leads his arm to swing out further than most bowlers. However, because his elbow is only slightly bent, he did not face any sanctions for illegal bowling.

2. 15 Degree Rule

Throwing in cricket is determined by the 15-degree rule, set and defined by the ICC. Under this rule, if a player’s elbow is bent more than 15 degrees between the horizontal motion and the time of release then the delivery is illegal.

This may seem an impossible task for umpires to verify with the naked eye. However, the officials are left to their own judgement to decide if a delivery breaks the 15-degree rule. 

If a player is deemed to bowl an illegal delivery, the following process takes place:

  • An umpire submits a report.
  • The player attends an ICC Accredited Testing Centre. Here they bowl in front of hi-tech equipment and experts in human movement.
  • A decision is made on whether the action is legal or illegal.
  • If legal, the player continues to play for their team.
  • If illegal, the player is suspended and must modify their technique to rectify the 15-degree rule.

Before the 15-degree rule, the rules on elbow flexing were stricter. There was no set amount of bend, but even if players flexed their elbows slightly, they would be called. 

However, following repeat calls of Muralitharan for bending his elbow upon delivery in the 1990s, the rules became more relaxed. Originally, the ICC set different rules for different bowlers. Five degrees was allowed for spinners, 7.5 for medium pacers and 10 for quick bowlers. 

Eventually, the flex degree was set to 15. This was decided because recognising any slight variation via the naked eye was near impossible for on-field umpires. 

3. Underarm Bowling

During informal cricket games, spectators may see bowlers throw the ball towards the batsman in an underarm motion. In modern cricket, this action is never used because ‘overarm’ bowling is now the norm.

However, this has not always been the case. Until the 1910s, underarm bowling was the preferred method of bowlers. But players soon realised they could generate more pace with a longer run-up and greater momentum. Underarm bowling remained in the rules until 1981 when one incredible incident between Australia and New Zealand led to the rules changing. 

The rival teams played in a five-match series during the 1980/81 season. In the third match, there was a tense finale. New Zealand needed six runs to win from the final delivery, but Australia captain Gregg Chappel informed the bowler, Trevor Chappel, to bowl underarm and roll the ball towards the stumps.

Both umpires were informed, and Chappel rolled the ball for New Zealand batsman Brian McKechnie to block. The delivery prevented New Zealand from any chance to score the required runs. Although the delivery was legal in 1981, it was frowned upon in the cricket community and led to calls of unsportsmanlike behaviour and even cheating.

Consequently, the rules were changed after the incident. Underarm bowling is not banned in international cricket, and it can only be used if agreed by both captains before the start of the match. 

4. No Ball

In addition to chucking and underarm bowling, there are other forms of no-ball in cricket. If any of the following are noticed by the umpire, ‘No-ball’ is called. Depending on the format (ODI, Test or T20), if a bowler delivers a no-ball, they have to bowl the delivery again, and the batting side is given an additional run. In T20 and ODI cricket, the batting side also gets a free hit for a no-ball. 

Below are some of the most common illegal deliveries in cricket that lead to a no-ball decision:

  • Overstepping: If the bowler’s front foot crosses the line that marks the beginning of the crease. This is the most common type of no-ball, with players regularly penalised for overstepping.
  • Dangerous Delivery: Sometimes, a bowler will pitch their delivery too short, causing it to bounce around the batsman’s head. A similar rule applies if the bowler bowls a ‘beamer’, which doesn’t bounce and aims anywhere over the batsman’s waist. This is less common than a head height delivery.

More no-ball examples exist, such as the ball bouncing off the pitch, the bowler hitting the stumps before their delivery. However, in top-level international cricket and even lower-level cricket, many of these rules are rarely seen. 

What is Suspect Bowling?

Suspect bowling is when the on-field umpires discuss any potential instances of throwing or chucking in cricket.

Certain procedures are followed in professional cricket if a player is thought to be throwing or chucking. Firstly, they will be given a warning by the on-field umpires. Then, they cannot bowl another illegal delivery otherwise they will be immediately suspended from bowling for the remainder of the innings.

Following the suspension of the innings, the player can continue in the match, but they cannot bowl for the rest of the game. Umpires then discuss the issue of suspected bowling after the match and inform the ICC or any other relevant cricket boards.

Examples of an Illegal Delivery in Cricket

Many of the world’s best bowlers have been called for illegal deliveries in world cricket, with some sanctioned and others not.  The most recent case of illegal bowling involved two Bangladesh players, Arafat Sunny and Taskin Ahmed. Both were suspended after suspect illegal bowling against the Netherlands in 2016.

In the past, top bowlers in international cricket, such as Shoaib Akhtar, Abdur Razzak, Marlon Samuel and Kane Williamson have all been sanctioned following suspect illegal bowling techniques.

However, not all players have been suspended for bowling techniques that edge on the illegal. Some of the players most scrutinised for their ‘throwing’ techniques include Australian pace bowler Brett Lee and Indian spinner Harbhajan Singh.

In 1999, Lee’s bowling action was under the microscope after two Indian umpires, Arani Jayaprakash and Srinivas Venkat, reported the Australian’s bowling action to the ICC following a test match against New Zealand. He was soon cleared but earned a reputation among supporters as a chucker.

Harbajan also came under scrutiny in 2005, after he was reported to the ICC following India’s test match win against Pakistan. The action for the spinner’s doosra delivery was particularly brought into question after the match, but he was eventually cleared. Harbajan had previously been scrutinised in 1998 for his bowling technique, but famously worked on eliminating an illegal delivery to his game.


Illegal deliveries in cricket take place regularly throughout matches at all levels. Instances of overstepping and dangerous bowling are the most common types of no-balls.

The issue of throwing was more common before the 15-degree rule was brought in during the early 2000s. This has allowed some flexibility for bowlers and umpires alike and lessened the number of players being called for illegal deliveries.

Furthermore, the protocols in place aim to support the bowler to rectify their delivery technique, rather than punish them, under the current rules. Players aren’t suspended or sanctioned for illegal deliveries but instead guided on how to improve.

Ultimately, rules around all types of illegal deliveries are in place to protect the batsmen and to ensure the bowling side does not get an advantage by chucking or bowling underarm.