Romero joined Man United this summer on a free transfer from Sampdoria and the Argentine has only conceded one goal in his opening five games.
Yet to concede to an opponent player, the 28-year-old has impressed United fans during the early days of his time at Old Trafford but Van Gaal is still still not convinced.
When asked about whether he has been happy with Romero’s start to life at United, Van Gaal told manutd.com: “I don’t think so because, until now, we don’t allow a lot of shots or moments in our area.”
“He has made very good saves, but until now, I think only maybe the save against Brugge at 1-0 was very important and he did also a save against Tottenham Hotspur and that was it.”
Romero made a stunning save to keep out Abdoulay Diaby of Brugge in midweek but Van Gaal was more complimentary about the rest of the team.
“He has not been able to show what he can do, and I think that is a compliment to the team.”
The manager was quick to praise Romero after his debut against Tottenham on the opening day of the Premier League season but it seems he doesn’t want the stopper to rest on his laurels.
United have kept four clean sheets in five games and a lot of the credit for the impressive defensive work by the back four.
With a trip to Swansea, who have had a good start to the season, next up, Romero could finally have his work cut out for him.