Mantha (lower body) won't return to Tuesday's game versus the Canadiens.
Mantha was injured in the first period and did not come out for the second. The 30-year-old winger should be considered day-to-day until more information is available. The Flames' road trip continues with stops in Boston on Thursday and Buffalo on Saturday -- if Mantha can't play, Kevin Rooney would likely rejoin the lineup.