"He's gonna be out for a while," coach Chan Gailey said Saturday. "... The guy can't get a break. He can't stay on the field and he's not getting enough reps."
Schouman was injured Thursday during Buffalo's 34-21 preseason win over the Indianapolis Colts.
The extent of Schouman's injury was announced a day after fellow tight end Shawn Nelson was suspended by the NFL for four games for violating the league's substance abuse policy.
"I always hate it when that kind of situation happens," Gailey said. "You hate it for the football team and for the individual involved."
Nelson, who is eligible to practice and play in preseason games, addressed the media for the first time Saturday.
"To my team, my family, my church family, the great city of Buffalo, and my fans I want to apologize," said Nelson, who did not practice. "It's nothing bad; nothing illegal that happened. There are rumors that it was dealing with some different types of things that myself is not involved in. I'm a guy of character who works hard."
In other injury news, Gailey said linebacker Reggie Torbor will miss at least three weeks after sustaining an undisclosed injury against the Colts. Defensive tackle Kyle Williams was held out of practice, but Gailey said he was banged up from Thursday's game and would be fine.