Malkin has already missed seven games since suffering the injury on Feb. 2, and he will not play against Tampa Bay on Saturday or Buffalo on Sunday. The next chance for Malkin to play would then come Wednesday against Boston.
"We have not made the decision yet for him to join the team in practice, and that's obviously the next step for him," Sullivan said.
Malkin, who skated on his own before the team's practice on Friday, has 23 goals and 49 points this season.
Information from The Associated Press was used in this report.