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When a player leaves the ground due to in­jury and is re­placed by a sub­sti­tute fielder, he/she is gen­er­ally not per­mit­ted to re­turn and im­me­di­ately re­sume bowl­ing (or bat­ting if their team's in­nings com­mences while they are off the field). The in­jured player is re­quired to spend a pe­riod back on the field at least equal to the time that they were ab­sent be­fore re­sum­ing bowl­ing. Vari­a­tions of the time pe­ri­ods re­quired and the cir­cum­stances of the play­ers re­turn to the field apply in dif­fer­ent forms of the game.

In 2005, the In­ter­na­tional Cricket Coun­cil an­nounced, as part of a pack­age of changes to the play­ing con­di­tions for One Day In­ter­na­tion­als to be tri­alled over a ten-month pe­riod, that tac­ti­cal sub­sti­tu­tions would be per­mit­ted. Each team was to be al­lowed one sub­sti­tute, who had to be named be­fore the toss was made, and could be in­tro­duced at any stage of the match. The ODI se­ries be­tween Eng­land and Aus­tralia in July saw the first use of these new reg­u­la­tions, which did not apply to other forms of cricket such as Test matches. This change, how­ever, was widely crit­i­cised by play­ers, com­men­ta­tors, and fans. In par­tic­u­lar, it was said to give the team that wins the toss an even greater ad­van­tage than usual. In March 2006 play­ers and of­fi­cials started to rebel against this con­tro­ver­sial rule and a One Day In­ter­na­tional se­ries be­tween South Africa and Aus­tralia saw the play­ers agree to boy­cott the rule. Just a few weeks later t...

If a bowler is in­jured dur­ing an over and can­not com­plete it, an­other bowler must bowl the re­main­ing de­liv­er­ies. The bowler cho­sen to do so can­not be the bowler who bowled the pre­vi­ous over, and must not bowl the fol­low­ing over ei­ther. A sub­sti­tute fielder may take the place of the in­jured bowler whilst they are off the field, but they may not bowl.

Ashley-Cooper, F. S. (1900). At the Sign of the Wicket: Cricket 1742–1751. Cricket: A Weekly Record of the Game. London: Cricket Magazine. OCLC 28863559.