Manchester United boss Sir Alex Ferguson is being careful with Anderson's comeback.
Anderson has been out since February following cruciate ligament surgery.
Although the 22-year-old returned to action in the reserves on Tuesday and then reported for training the next day, Ferguson is wary of expecting too much, too soon.
"You have to be aware he has been out for a long time," he said.
"You have to monitor his progress a lot more carefully.
"But he is keen. He trained on Wednesday. He wanted to train after the game on Tuesday. That shows the enthusiasm he has got."
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