Romelu Lukaku needs to believe he deserves to be at Manchester United after struggling during Sunday's derby, says former captain and full-back Gary Neville.
The Belgium international striker failed to clear the ball as David Silva and Nicolas Otamendi scored from set-pieces, while he was denied by City goalkeeper Ederson from close range late in the Manchester blockbuster.
Lukaku — a £75million signing from Everton — has now scored just two goals in his past 14 matches in all competitions, and ex-United star Neville is concerned.
"You look at him today and he struggled," Neville told Sky Sports.
"I'm not just talking about struggling in terms of missing a chance, he struggled at being in the game and being confident in the game.
"He's got to get over that quickly as he's Manchester United's centre-forward.
"He's a young lad but he needs to get to the point where he believes he should be out there — it's like he doesn't believe it in this period."