3 goalkeepers and 3 outfield players have been let go.
Cameron Borthwick-Jackson, Regan Poole, Devonte Redmond and Matty Willock were all unused.
Man United's 20-year-old midfielder Devonte Redmond has signed for Scunthorpe United on a six-month loan deal, lasting until January 2018.
DJ Buffonge made and scored a goal as Man Utd's under-23s came from behind in a friendly at Bradford City's training ground.
Goals from Gribbin and Scott earned United a friendly draw at Moor Lane against National League opposition.