The ever-present racked up 27 appearances and progressed into Warren Joyce's Under-21 and Reserves squad for the final weeks of a successful campaign.
"I think Liam Grimshaw is one of these players who might be very useful to a squad as he can play in a number of positions," McGuinness told ManUtd.com.
"He can operate in front of the back four, in midfield, the right side of midfield, full back. He could be very vital to a squad. Maybe a bit like John O’Shea or Phil Neville, he could be able to do all those roles and the reason he can do it is he’s got a fantastic mentality. He will have a go in each position and he’s got good qualities."
Grimshaw was also named captain for the club’s first foray into the UEFA Youth League.