Alex Chiasson is dealing with an undisclosed injury.
Craig Anderson (hand) has been placed on the injured reserve list.
Mika Zibanejad registered five shots and posted his 12th goal in Thursday's 6-3 loss to Dallas.
Alex Chiasson ended a 16-game goalless drought Thursday night.
Robin Lehner made 35 saves on 39 shots in the Senators' 6-3 loss to Dallas on Thursday night.
Bobby Ryan scored a goal and an assist in Ottawa's 6-3 loss to Dallas on Thursday night.
David Legwand, Patrick Wiercioch and Mark Borowiecki are scratches in Thursday's game against Dallas.
Mark Borowiecki (leg) has been medically cleared to return, but he won't play Thursday.
Andrew Hammond has been summoned from the minors on an emergency basis.
Robin Lehner will be in Ottawa's crease Thursday versus Dallas.
Craig Anderson has a hand injury that will probably keep him out of the lineup against Dallas on Thursday.
Brad Mills has been assigned to AHL Binghamton.
Colin Greening has been sent to the minors.
Colin Greening went unclaimed on waivers.
Kyle Turris and Clarke MacArthur were split up during Tuesday's practice.