Manchester United boss Erik ten Hag has blocked Dean Henderson from departing.
Henderson and Nottingham Forest want to make last season's loan into a permanent transfer.
But Ten Hag will not approve the move until their goalkeeper options are settled.
With David de Gea now off contract, United do not have a recognised No1 on the books.
As such, Ten Hag will not allow Henderson to be sold until his keeper dilemma is solved.