Man Utd player-coach Giggs says Moyes needs time to learn Champions League ropes
United are at Shakhtar Donetsk this week.
"It does take a few years to get used to European football," said Giggs.
"It's different to playing in the Premier League.
"For that reason I think the young lads who now have a couple of seasons' experience under their belts will contribute even more this time around."
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