The 18-year-old – subject of an enquiry from Leeds in January -–has agreed a three-year deal with United, who brought former Latics player Joe Gelhardt to the club last August for a £1m fee.
McGurk helped Wigan under-18s to the Professional Development League National championship last season, scoring 13 goals.
The talented schemer also caught the eye in the club’s 2019-20 FA Youth Cup run in scoring against Birmingham City and Manchester United.
The Liverpool-born player will link up with Mark Jackson’s under-23 side, who will play in the Premier League 2 Division 1 next season.
Rotherham United have turned down an offer from an unnamed Championship club for midfielder Matt Crooks.
A number of second-tier sides have been linked with the 27-year-old, while League One outfit Ipswich Town have already seen several bids – understood to be in the region of £600,000 – rejected for the player.
Crooks is valued in the seven-figure bracket by Rotherham, who have yet to make an incoming signing so far during the close season.
Former Sheffield Wednesday and Hull City defender Moses Odubajo is on trial at QPR.
Ex-Northampton, Crewe and Cheltenham striker Billy Waters has become Halifax Town’s second summer arrival following the earlier addition of midfielder Harvey Gilmour.