The Florida Panthers will open training camp later this week without their backup goaltender.
Clemmensen, 36, appeared in 19 games for the Panthers last season. He went 3-7-2 with a 3.67 goals-against average and .874 save percentage.
With Clemmensen out, Michael Houser could see increased playing time during the preseason. The undrafted 20-year-old spent last season with the Cincinnati Cyclones in the ECHL.