Turner says Dean Henderson's dream of being United's No.1 will have to go on hold.
He's on contract at United for another two years but clearly he is making great strides and is proving himself a top keeper in the making," said Turner to the Mirror of Henderson, currently on-loan at Sheffield United.
“In many ways he's in a great position but his next step is vital and the worry for United is that if he doesn't see a way past De Gea he'll want to leave.
“He won't be happy to go back and sit in United's reserves and you couldn't blame him because he has the potential to be a fantastic keeper.
“I'm sure United know that – and that's why it's such a tough decision for Solskjaer.
“I can't see Solskjaer shoving De Gea out of the first team to make way for Dean. He's recently signed a big long-term deal and is firmly established.
“He's proved himself a top keeper the last few years and, although he's made some mistakes the last year or so, he's still one of the very best around."