United dismissed Solskjaer after a dismal 4-1 defeat to Watford in November, with the club seventh in the table and 12 points adrift of leaders Chelsea at the time. Ralf Rangnick's appointment as interim boss the following month was supposed to provide the Red Devils with the structure and impetus to kick on and challenge for the top four.
But the German has failed to give United the kick up the backside they required, with last week's embarrassing 4-0 defeat to Brighton putting the nail in the coffin of their lingering Champions League hopes.
Speaking to Paddy Power, the former Brazil ace said: "With Ole Gunnar Solskjaer, fans weren't happy with the style of football United were playing but the mistake wasn't hiring Ralf Rangnick, it was firing Solskjaer.
"It's never a mistake to bring in a new manager but Rangnick has a clearly defined methodology of pressing, bringing through young players, and the team moving as one. It's hard for the players to adapt to this new style so quickly.
"The mistake was firing Solskjaer and bringing in someone with a completely different methodology and that's impacted United's results.
"He [Rangnick] hasn't really improved on the way United played when Solskjaer was in charge, and we still see the same low quality and low intensity performances.
"They should have stuck with Solskjaer until the end of the season and given the new manager pre-season."
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