Parker has urged Ole Gunner Solskjaer to axe the midfielder this summer.
"He's bringing too much negativity to the club. His quality is incredible, but he's averaged about one performance in 10, that's how bad he's been.
"I think they need to shift on from him now, I see any comeback now as being very, very difficult. He's been a bad fit all round.
When you see Lukaku now scoring loads of goals, he had to leave because he was affecting the club and the dressing room - it was the right decision.
"Pogba's agent says he sees Juventus as his home. He left his home for a package holiday, the package was the big package and now he wants to return – that's what it seems like."