Arsenal manager Arsene Wenger hopes Robin van Persie will be back in first-team contention before the end of the season.
The Netherlands striker has been on the sidelines since suffering a serious ankle injury while on international duty more than four months ago.
It had been feared that van Persie, who had scored eight goals in 15 appearances before suffering the injury, would not play again this season but Wenger has revealed that the player has now returned to training.
He warned though: "Do not expect miracles when a guy has been out for such a long time. We are, though, happy to have him back and he is physically, fitness-wise, in good shape.
"We have just to get him back to full team fitness - that will take two to three weeks maximum. After that you have to get a few games to get back to your best. It is very difficult to predict.
"Physically it looks all good, but after that when he plays in games you have to see how his ankle responds. When you are hit by injury, the first three weeks are very difficult. I believe that is behind him now, once you start to practice again.
"The most important thing at that age is to be tired at night - when you can train, you can deal better with the frustration. When you lie at home at the start of your injury and cannot even do anything, it is very frustrating. I believe the hardest time is behind him."