Although he could yet be back in action by the end of February or the beginning of March, Foster has effectively written off the season after being forced to undergo cruciate ligament surgery last summer.
But Foster is not getting too downhearted; United's physios have seen to that.
"The physios have a good sense of humour and are a good laugh," he said.
"It is nice to have those kind of people around you. It keeps you positive.
"They have a dark sense of humour. It is like a comedy act and breaks up the monotony."