LAKE FOREST, Ill. -- The Chicago Bears may be down only one starter when they face the Minnesota Vikings on Monday Night at TCF Bank Stadium. Linebacker Pisa Tinoisamoa (knee) is listed as questionable after being limited in practice on Saturday. The veteran has missed the team's past two games after undergoing a right knee scope Dec. 3 to fix a lingering knee issue that also forced Tinoisamoa to sit out a November 18 meeting with the Miami Dolphins. "Pisa Tinoisamoa is still working his way through some things," Bears head coach Lovie Smith said. Tinoisamoa was able to test out the injured knee throughout the week -- and had full participation on Friday -- but simulating live game action is difficult because practice is never full contact. The highly publicized venue change also hurt Tinoisamoa's chances of returning, since it's likely his knee would've responded more favorably in the climate-controlled indoor setting of the Metrodome. It remains a strong possibility that Nick Roach will make his third consecutive start at strong side linebacker when the Bears take on the Vikings. Despite being forced to split time with Rod Wilson, Roach made four tackles and broke up a pass in the Bears' 36-7 loss to New England. The Bears moved Saturday's practice to Northwestern University to get better acclimated to playing on an outdoor artificial surface. The outdoor practice fields at Halas Hall are natural grass, and head coach Lovie Smith opted to conduct practice indoors on Thursday and Friday. Meanwhile, in addition to quarterback Brett Favre, the Vikings will again be without starting guard Steve Hutchinson who has been ruled out due to a thumb injury. Running back Adrian Peterson and defensive end Ray Edwards are both listed as questionable.