Paul Pogba suffered an injury strain after Juventus' victory over Empoli.
The Frenchman broke down in the final minutes of the game.
Pogba was a second-half substitute, but suffered a strain and appeared to suggest a hamstring injury as he left the pitch late on.
Juve coach Max Allegri later said: We don't know anything yet, he felt a twinge at the back, so we'll see what the tests say."
Juve won 2-0 against Empoli on Sunday.