He said, "That is pathetic.
"We don't have to answer this question in this moment. Because it isn't.
"We have these problems and the problems have caused us an effect in results. But I don't know where we would be if we had the players on board.
"If we had all of the players on board, we will get more points and have more consistency in the backline."
The Dutchman also said: "Any manager can do better but also I am two years here and I have one time had a full group of players. You can't progress a team in certain key areas with so many injuries. It's like swimming with your hands on your back and you have to keep your head above the water level, that is what we try to do.
"We are still in a cup final. This is good. But if you want to progress a team you need fit players and you see our opponent today, they had only one not 100 per cent match-fit player and we had so many.
"I don't like reactions but you have to always be there, you have to always be spot on when you are Man United. But if it happens, you need a reaction and the players gave the reaction."