But United striker van Persie, who has missed a large chunk of the season with a thigh injury, is certain Moyes will succeed, given time.
"I think he needs time like everyone, especially if you are new at such a big club,'' Van Persie told the Guardian.
"And to be fair, I don't think people don't understand that they have to give him a little bit more time, and I am talking about fans or even us.
"He will get that time and everyone is convinced that we will change things sooner than later.
"We lost many points this season, too many in our opinion, because if you want to go for all the trophies, you have to play better and get more wins in - but we are doing everything we can to change that.
"The manager is our leading man in that case and he is trying his best and I think he will turn things around.''
-AAP