England have made Irish-born batsman Eoin Morgan vice-captain to Stuart Broad for the Twenty20 international with Sri Lanka in Bristol on Saturday.
The England and Wales Cricket Board said Broad would be fit to lead the side after a niggle in the final Test.
Were he to take charge at any point Morgan, 24, who has been made vice-captain "going forward", would become the first Irishman to lead England.
An official deputy to Alastair Cook in the 50-over team is to be named soon.
Dubliner Morgan began his international career with his native Ireland, playing 23 one-day internationals between 2006 and 2009 and scoring 744 runs at an average of 35.42.
He made his England debut in 2009 and scored a half century against Australia in only his sixth innings and produced a succession of match-winning performances, scoring runs in innovative fashion with a calm temperament in high-pressure situations.
Having established himself as a key figure in the one-day team, Morgan was chosen ahead of Ravi Bopara to replace Paul Collingwood in the Test side this summer and struck successive half centuries in the final two Tests against Sri Lanka.