Sheffield United manager Chris Wilder says Billy Sharp is free to leave the club.

Middlesbrough and Nottingham Forest are both interested in the Blades captain, who has struggled for regular playing time this season.

"As far as I am concerned he is one of five strikers. The boys at the top of the pitch are doing really well and he's, yet again, knocking on the door," Wilder told Sky Sports.

"We're only 21 games in, there is a part for him to play this season, if he comes knocking on my door and says 'this isn't for me, I need to go get some regular football', then I'll take that.

"Whatever Billy wants to do - he's possibly the only player at the football club (this applies to) - whatever he wants to do, I will adhere to his wishes.

"I think that is only right in terms of the contribution he has made to this football club."