Callahan's timetable for a return is undetermined right now. (LeBrun)
Tampa Bay plays Montreal tomorrow with a chance to clinch a spot in the Eastern Conference Final.
He had 24 goals and 30 assists for Tampa Bay this season but has only three assists in 12 playoff games.
He is averaging 18:17 per game and has 42 hits, 9 blocked shots and not killing penalties.
For a lot more on Callahan, click HERE.
In September 2011 Patrick Sharp had an emergency appendectomy and was ruled out 3-4 weeks. (NHL)
Jaime Benn was ruled out 10 days to 2 weeks after appendectomy surgery. He missed five games and returned 10 days later. (ESPN)
Max Pacioretty returned after 8 days. (NHL)
Jonathon Ericsson returned to play after 3 days. (NHL)