Umenyiora and Baas missed last Sunday's 38-35 loss to Green Bay, and did not practice all week because of their respective injuries.
Umenyiora is still dealing with an ankle injury suffered two weeks ago against New Orleans, while Baas is described on the team's injury report as having a neck injury and intense headaches.
When asked about Baas on Friday, head coach Tom Coughlin said, "They are continuing to talk with the doctors and we will have something shortly."
Additionally, safety Kenny Phillips is listed as doubtful because of a left knee injury he sustained against the Packers. He underwent microfracture surgery on the same knee during the 2009 season.
Running backs Brandon Jacobs (hamstring) and Ahmad Bradshaw (foot) are listed as probable. They missed practice Wednesday and Thursday, but took limited reps Friday.