Herve was a key cog in the Terps' 2018 national championship run, notching four goals and three assists.
“It kind of felt like Ludwig again."
Blumberg made two appearances for League One side Charlton Athletic before coming to the Terps.
Paul Bin, William James Herve and Brayan Padilla were sidelined for much of 2019.
The Terps circulated a picture on social media kneeling in solidarity against police brutality and racism last week.
The son of Kenyan immigrants, Ngobu played for various club teams in Maryland before coming to College Park.
The German started 18 games, and was an all-Big Ten second team selection in 2019.
Players are using toolboxes and empty fields to stay in shape instead of state-of-the-art equipment.
The Terps added two midfielders and a goalkeeper.