Chytil didn't participate in Friday's practice session due to an upper-body injury, Jeff Paterson of CanucksArmy.com reports.
Chytil is being evaluated after the team said that he aggravated an upper-body injury that forced him to miss the first eight games of the regular season. It's not yet clear whether he'll be available for Saturday's game against the Maple Leafs, but Brendan Gallagher will be a candidate to enter the lineup if Chytil is sidelined.