Tavares sustained the injury in the third period of Friday's 2-1 victory over the New Jersey Devils. The 26-year-old needed assistance to leave the ice after trying to avoid Devils defenseman Steven Stantini.
Tavares has a team-leading 66 points (28 goals, 38 assists) for New York (36-29-12), which has an uphill climb in its quest for the postseason with only five games remaining on its schedule.
The Islanders recalled forward Connor Jones from the Bridgeport Sound Tigers of the American Hockey League. Jones, 26, has played 56 games with the Sound Tigers this season, recording 18 points (five goals, 13 assists).
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The St. Louis Blues recalled defenseman Petteri Lindbohm and forward Kenny Agostino from their AHL affiliate, the Chicago Wolves, under emergency conditions.
Lindbohm, 23, appeared in 47 games for the Wolves this season, posting 15 points (seven goals, eight assists). He played in five games for the Blues, serving four penalty minutes.
Agostino, 24, leads the AHL with 79 points (22 goals, 57 assists) through 63 games with the Wolves this season. He also made seven appearances with the Blues, posting one goal, two assists and two penalty minutes.
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The Tampa Bay Lightning recalled forward Joel Vermin from the Syracuse Crunch of the AHL.
Vermin, 25, skated in 16 games with the Lightning this season, recording three assists. He played in 22 career NHL games, all with the Lightning over the past two seasons, notching four assists and four penalty minutes.
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The Carolina Hurricanes reassigned goaltender Alex Nedeljkovic to the Florida Everblades of the ECHL.
Nedeljkovic, 21, made his NHL debut in relief on Jan. 17 at Columbus, and had 17 saves on 17 shots faced in Carolina's 4-1 loss to the Blue Jackets. He appeared in 25 games this season for the Charlotte Checkers of the AHL, posting an 8-14-1 record, a 3.40 goals-against average and an .881 save percentage. In 10 games with the Everblades, Nedeljkovic has a 4-4-0 record, with a 3.64 goals-against average and a .885 save percentage. (Editing by Gene Cherry)