Prior, who was recalled ahead of England's home series against Sri Lanka after being dropped towards the end of the 5-0 Ashes defeat to Australia, suffered mild tightness in his right thigh during training on Monday.
Despite the call-up, England captain Alastair Cook told reporters on Tuesday that Prior was "99.9% certain" to play although he would be assessed before the match starts.
Buttler has played 33 one-day internationals and 36 Twenty20 matches for England.
(Reporting by Josh Reich/TonyGoodson; editing by Amlan Chakraborty)
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