The Florida Panthers will be without forward Matthew Tkachuk for about another week because of an illness, meaning he could wind up missing at least six games.

The Florida Panthers will be without LW Matthew Tkachuk due to illness against the Buffalo Sabres, per NHL insider Elliotte Friedman. In his place, Spencer Knight will get the start. The Panthers will also be without C Aleksander Barkov (lower body), who is expected to miss two to three weeks.

Barkov was injured in the final minutes of Florida’s 3-1 loss to the Ottawa Senators on Thursday when he crashed feet first into the board trying to defend an empty net.