The midfielder gave a timely reminder of the quality he still possesses in the 5-0 Champions League win in Germany on Wednesday, with two assists, as he prepares to turn 40 on Friday.
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Moyes, who promoted Giggs to player-coach following his close-season arrival at Old Trafford, told reporters: "He's an unbelievable footballer and is even getting better. His vision, his pass for Nani's last goal, you wouldn't say he needed to come off because of his fitness.
"Some people have mentioned his age , but you can't mention anything about his footballing ability.
"He's a wonderful footballer and I’m lucky to be working with him.
"I got asked the question the other day about how long he'll carry on and the situation with Ryan is that you keep playing.
"He'll tell us when he thinks he's had enough, but he keeps training, he keeps playing and his performances have been excellent."