Underwood was substituted in Tuesday's defeat at Loftus Road because of a hamstring injury and he has not recovered for Saturday. Kevin Foley and Marcus Heikkinen may return to the team after missing the QPR match. Foley was missing because of a knee injury picked up whilst on international duty, and Heikkinen missed out with a groin injury picked up against Wolves.
Steve Robinson is also a doubt. The midfielder picked up a rib injury in training and missed training yesterday. Keith Keane is available for selection again, but Rowan Vine is still injured from pre-season.
Hull have no injury worries because Stuart Elliott is fit.