In his column for the Daily Mail, the ex-Liverpool midfielder wrote: "Alejandro Garnacho has not started any of Manchester United’s last six games, but would be one of the first names on my teamsheet at Anfield on Sunday.
"If Liverpool have shown any weakness this season, it has been when players like Anthony Gordon, Callum Hudson-Odoi and Tyler Dibling have run at them at speed. When Arne Slot’s men first see United’s team, they’ll be more concerned if Garnacho and Amad Diallo are in it rather than Rasmus Hojlund, for example."
He added: "I know there has been mention of Garnacho showing dissent to Amorim, and it may turn out he is not part of United’s long-term future because of the manager’s preferred formation. But whatever happens in the future should be set aside on Sunday. Liverpool away is a one-off. It is United’s biggest fixture and Amorim desperately needs to get a result.
"For 90 minutes, forget about the future project - try to get a result now. Garnacho is one of the few assets he has that will worry Liverpool. We saw against Newcastle on Monday that Hojlund running one-on-one against Fabian Schar posed little threat to a top defender."