Paul Bin, William James Herve and Brayan Padilla were sidelined for much of 2019.
The German started 18 games, and was an all-Big Ten second team selection in 2019.
The season is still due to start in early September despite the schedule change.
Players are using toolboxes and empty fields to stay in shape instead of state-of-the-art equipment.
A 3-0 loss to Wake Forest in the NCAA tournament ended the Terps' rocky campaign.
Defenders Brett St. Martin and Ben Di Rosa picked up injuries in the Terps' win over Iona.