The Argentine keeper looked shaky against the Swans and he was at fault for their winning goal as he let a Bafetimbi Gomis shot slip under him.
Romero was brought in this summer and he has been playing in the absence of David de Gea, who has been ostracised by van Gaal amid strong speculation linking him with a move to Real Madrid.
Van Gaal insisted that the blame for Swansea’s winning strike doesn’t lie solely with Romero.
“You can write everything you want. What I always say is defending starts in front and not only in the last line,” the manager said.
“You can always analyse errors but I don’t think that is a good way. You have to see the way the team is defending as a team and then I know what errors has been made.
“At the end, of course, the pressure for the last defender or goalkeeper is always higher. I don’t agree when you only say the goalkeeper was not so good.”
Romero may well have the backing of his manager but the fact remains that he isn’t half the keeper that De Gea is.
Attention will turn to whether or not De Gea stays at Old Trafford as the transfer window draws to a close. If he does, one would imagine that he will be phased back into the side sooner rather than later. If he doesn’t, Romero cannot be trusted to be United’s No.1 all season long.