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 but injury hampered his progress as the season wore on. He was loaned out to Morecambe at the end of March and will strive to obtain regular football this season.