Joyce is a former long time United academy coach.
He told the Manchester Evening News: "He's done great, you're delighted for the kid, he came in and was maybe not up to speed, but he's got better and better, it's a credit to the culture the manager instils in the football club.
"There's a vibrant group of young players there who are destined for the Premier League."
The fact Garner has had to overcome some difficulties this season will stand him in good stead for the future, according to Joyce.
"You need some struggle to get better and to know what it feels like, to find out about yourself," he said.
"He'll know himself how much the manager has helped him here and how much he's had to find the answers within himself to come through and play as well as he's done and be involved in the type of football the first team have been playing here.
"It's been really exciting to watch and it bodes well for his future."
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