The result represented United's first loss of the season and after suffering a Champions League exit in the group stages last season, Ferdinand has ramped up the pressure on Red Devils Solskjaer, reiterating that the Norwegian has yet to prove he is a trophy-winning manager yet.
"Of all the managers in the top-four fight, Ole hasn't proved he can win at this level yet," Ferdinand told BT Sport on Tuesday night. "He's done what he's been asked to do up until this point. Now its D-Day.
"It's his squad, shaped by him, a wonderful transfer window just gone, bringing in winners, people that can change the culture of this club.
"Now he'll be judged properly. Now you've got to convert that to trophies and if he doesn't his head will be on the chopping block like any other manager."
Ferdinand and Solskjaer crossed swords in the press in preseason after the former's criticism of Phil Jones remaining with the club.
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