The midfielder impressed last term on-loan with Brighton and Birmingham City.
He told manutd.com: "Training has been hard work but everyone has enjoyed it. We've been working on some new things which is good for us. We're still adapting to how the manager wants to us to play and his structure but that's something we're enjoying.
"I learnt so much from the loan spells last season. Playing in front of big crowds every week was great for my confidence and I was starting every game too against tough opposition. I think it'll hopefully stand me in good stead for this season."
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