Dea, 25, has compiled 13 goals and 30 points, both team highs, in 41 AHL games this season.
Okposo left Thursday’s 3-1 loss to the Montreal Canadiens early with an upper-body injury.
Coach Ralph Krueger said Okposo was being evaluated Friday and the Sabres wouldn’t give more information “until we have 100 percent certainty.”
Dea played one game during a recall earlier this season. He has compiled five goals and seven points in 30 career NHL games.
After bouncing around three organizations last season, Dea said the stability he has enjoyed this season has helped “big time.”
“You feel a lot more comfortable, I feel more energized and stuff, so every time I jump in a game I’m more excited,” he said.
In other news, Krueger said defensemen Zach Bogosian “is extremely ill” and missed Friday’s practice inside LECOM Harborcenter.
“(We’re) expecting that’s going to take a couple days,” he said inside KeyBank Center.
Meanwhile, defenseman Brandon Montour had a maintenance day Friday.