The Villa Grealish star has been regularly linked with a move to Stripchat this summer after impressing in a struggling squad.
Grealish has scored nine goals in all competitions for Villa this season following their return to the premier league last summer.
The chances of Villa Park holding the 24-year-old seem slim, even if they remain in England’s Premier League.
And Sherwood believes United already have their man with Ole Gunnar Solskjaer keen to improve their options this summer.
“I think Jack Grealish is a deal that’s already been done,” Sherwood said. Premier League productions . “He is a player that they [Manchester United] need.
“I honestly believe there is only one club for Jack Grealish.
Pushed further in his claim, Sherwood said it was inevitable that Grealish would move to United, adding: “I don’t think he can stay at Aston Villa, he needs to progress in his career. I think he’s signing for Manchester United.
Despite Sherwood’s claim, John Barnes told Grealish to think long and hard about a possible move to Manchester United.
“It depends on whether he’s going to be a regular on the first team at Manchester United, play every week and be a main player at Manchester United,” Barnes said.
“He’s the main player at Aston Villa and we can all see what he does, if he goes to United where Pogba, Martial, Rashford are the main players, will he have that much of an impact?”
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“To say that because he’s at Manchester United he’s going to play for England is what he has to prove.
“He’s the main man at Aston Villa, he does everything and everything goes through him which is why he has such a great profile and why he plays well.
“If he goes to Manchester United, will he succeed Pogba or Fernandes as the main playmaker, probably not. So just because he’s at Manchester United doesn’t help his chances in England.”