Gilbert, who signed in late September after going to training camp on a professional tryout, underwent sports hernia surgery in Philadelphia on Thursday.
Gilbert had played in all of Florida's first 73 games, totaling three goals, 25 assists and a minus-5 rating. His average ice time of 21:20 is second on the Panthers behind defense partner Brian Campbell, who is averaging 27:17.
"He's been dealing with it for a while and playing through it, having to take therapy and medicine," Panthers interim head coach Peter Horachek said after morning skate in preparation for a game against the Carolina Hurricanes on Thursday. "It was to a point where something needed to done."