Toronto Maple Leafs goaltender Petr Mrazek left Tuesday's game against the Boston Bruins in the first period with a groin injury and won't return, the team announced.
Erik Kallgren took over in goal for the key Atlantic Division clash.
Mrazek has already missed time twice this season due to groin injuries.
The 30-year-old entered the game with a 12-6 record and an .890 save percentage.
Mrazek signed a three-year contract with the Maple Leafs this past offseason. He was waived March 20 but went unclaimed, and he's since won back-to-back starts.
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