The 16-year-old striker has caught the attention of supporters following an explosive season with the Under 18s, netting 17 goals in as many starts.
Garner’s father confirmed last week that his son James, nominated by Kieran McKenna for the Jimmy Murphy Young Player of the Year award in May, would also join the pre-season tour.
According to M.E.N‘s Samuel Luckhurst, both Greenwood and Garner will get a chance to impress Jose Mourinho in the absence of several key players over pre-season, while starlets Tahith Chong and Angel Gomes, who both rose from the Under 18s to the Reserves last season, are also expected to be on the tour.
Callum Gribbin is another player deserving of a chance to play in the first team over the summer but appears to have been sidelined for Greenwood, whose frightening pace on the last line of defence and acute finishing has piqued the interest of many supporters.
With Romelu Lukaku, Rashford and Lingard all set to miss a considerable portion of pre-season, he has a massive chance to impose himself.