Anderson was a second-half substitute as United came from behind to win 3-1.
Of his seven Premier League appearances this term, only one has been from the start and he has not completed the full 90 minutes in a league match since September 2011.
There have been vague insinuations Anderson's fitness is lacking and despite all the high-tech sports science techniques, as former United goalkeeping coach Tony Coton said on MUTV: "Once they leave the training ground, you can't go with them.
"I am not saying this is his lifestyle, or it is a problem. But you can't live with them 24 hours a day so there may be something that is occurring out there that we don't know about."