De Gea has been awful in the last three games and I think, Sergio Romero should replace him in the starting XI.
The 29-year old has been one of the few players to perform well for United this season, captaining the side on a number of occasions.
United have now lost seven of their last nine games in all competitions, leaving them three points outside the top four in the Premier League.
Manchester United made a positive start and managed to keep the Citizens at bay until half-time before the defending champions made the breakthrough.
Solskjaer added: "Of course, we want to get into the top four".
Kensington Palace releases photos of Prince Louis to mark his first birthday
And when compared to a snap of Kate Middleton at the same age, the young royal is the spitting image of his mum. Louis is seen smiling in all three of the photos, with his two bottom teeth showing.
"We need more quality on Sunday and if we win that game, we have two games to go", Solskjaer said.
"I know I said it already, in another interview before, in a situation like that you assess it a little bit yourself and I was completely calm".
United are now sixth position in the Premier League with 64 points and three games to end the season. The midfielder has been linked with a move to Real Madrid, however Solksjær believes that "I can assure you that he is very determined to be successful at United". "He's a human being as well and we're all the same; we want him to do well, he's a leader in that dressing room and on the pitch".
"We have to try our best and work every day, that's what Ole has to do".
"I think that Eden deserved to be in the top of 11 of the Premier League", Sarri said.