Ajax manager Frank de Boer admits it will be difficult to keep goalkeeper Jasper Cillessen at the club.
Manchester United are expected to make a move for the 26-year-old to replace David De Gea who is expected to leave to join Real Madrid.
And de Boer seems resigned to losing the Dutchman.
"For us it would be a disaster if that's going to happen because it's already very difficult to find a good goalkeeper, especially if you have the best goalkeeper in Holland," de Boer told Sky Sports News HQ.
"We want to keep him and he wants to stay, but if Manchester United come with a bag of money it can be difficult.
"We have to wait but the transfer period still has a long way to go."