The 20-year-old missed the whole of the 2019-20 campaign after suffering an ACL injury in a first-team friendly against Tranmere Rovers.
Having looked sharp in pre-season ahead of 2020-21, he then damaged ankle ligaments in a Premier League 2 fixture with Southampton in November.
The forward made a scoring return to action in April during the away game at Tottenham Hotspur, before ending the campaign by providing an assist versus Leicester City.
Glatzel will get more minutes this evening as Lewtas takes his U23s side to League One outfit AFC Wimbledon (kick-off 7pm BST).
The friendly encounter has been arranged as a test event by the home side as they will welcome around 2,000 fans, socially distanced, into their new Plough Lane stadium for the first time.