Barcelona midfielder Philippe Coutinho has refused to rule out the possibility of leaving the club for Manchester United.

Coutinho's future has come under scrutiny in recent weeks amid reports that Barca are unhappy with the Brazilian's form since his €142m (£124m) arrival last January.

United have emerged as surprise frontrunners for the former Liverpool man's signature, although they are yet to make an official approach.

When questioned over his future following Wednesday's 6-1 Copa del Rey win over Sevilla, Coutinho told beIN Sports: "Nobody knows what will happen in the future. All I have in my head right now is to work hard."

Coutinho has scored eight goals in 30 appearances for Barcelona across all competitions this season, but he has made only 12 La Liga starts in 2018-19.