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The Frenchman's involvement was called into question when he wasn't seen at the club's Lowry Hotel base with his team-mates earlier on Saturday.
And Pogba was then left out of Solskjaer's matchday squad altogether this evening.
The midfielder featured for France with no problems over the recent international break.
But Solskjaer claims the unsettled star has picked up an ankle problem since returning to England and subsequently had to be left out of this evening's home tie.
"He [Pogba] tried to finish the last session but it [ankle] got worse and worse so he is unavailable today," the United boss said.
"Hopefully he is OK for Tuesday [against Istanbul] but we'll see."
Pogba impressed for France over the international break, with national team manager Didier Deschamps voicing his opinion over the midfielder's United struggles.
But Solskjaer says he has spoken to the unsettled star since he returned to England.
“I spoke to Paul today about it,” he said this week.
“Of course, he’s not happy when he’s not been playing and not playing really well. He’s not been happy with his [club performances]. But Paul had a difficult season last season.
"Then he’s had Covid. But three games for France have helped him get his fitness and rhythm.
"I spoke to him and he feels stronger for it. He plays in the same position for France as he does for us, so that scenario isn’t an issue.”
“It’s about getting momentum and rhythm and Paul said he felt really strong towards the end of the games against Portugal and Sweden.
“After Covid he needed time to recover but now he looks fitter and stronger.
"I think he’s going to improve and be a very important player, and person, for us. To have him in form is vital.”