Pogba was again well below par on Tuesday evening as United slumped to a 4-0 aggregate defeat to Lionel Messi's Barca.
Neville has accused the Frenchman of effectively returning to the poor form which saw Jose Mourinho get sacked at Old Trafford.
"Pogba’s now playing how he was pre-Ole’s arrival," the former United defender told beIN Sports.
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I thought he was really poor, rolling his foot over the ball all the time, playing for himself, not popping it off and moving, didn’t look interested at times.
"But he’s a great player, and can be a great player, he just needs to get that focus back."
As for De Gea, Neville was a bit more sympathetic but also believes the Spaniard should come out and explain his costly mistake at the Camp Nou which gifted Messi his second.
"I don’t know where it came from. I know people have said De Gea has made some mistakes in the last 12 months - but not many like that for Manchester United. I can’t think of any like that for Manchester United," he added.
"I think it’s important when you make a mistake of that nature, in your home country, he’s now an experienced player. I hope he’s the one who comes out and explains it. I think that would bode well for him."
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