Reece Brown, Oliver Gill and Conor Devlin will all spend the next four weeks furthering their football educations on loan.
Defenders Brown and Gill join League Two side Bradford City, while goalkeeper Devlin joins League One's Hartlepool United. All three have agreed deals until 25 October.
The trio follow Oliver Norwood, Ritchie De Laet and Nicky Ajose, who have all embarked on four-week moves in recent days, as the club seeks to keep players ticking over during a five-week gap in fixtures for the Reserves.
United now have a total of 14 players out on loan across England's top four divisions.