Manchester United hero Paul McGrath says they can upset Manchester City in the FA Cup final.

McGrath insists they can beat City by spoiling the game.

He wrote for the Sunday World: "Manchester United have done it before and they can do it again by messing up Manchester City's treble dream in next Saturday's FA Cup Final.

"Back in 1977, Liverpool won the Championship and would win the European Cup a few days later.

"But in the FA Cup Final of that year, United beat Liverpool 2-1, with the winner being scored by Lou Macari or Jimmy Greenhoff, depending on who you are talking to.

"Lou hit the shot, the ball glanced off Jimmy's chest and ended up in the Liverpool net for the winning goal.

"Now for a repeat.

"Manchester United supporters won't care how the winning goal arrives next Saturday.

"They just want a winner, desperately, to ensure that the Red Devils' own treble of 1999 stands alone.

"But United are up against it in the FA Cup final, of that there is no doubt."