Holzer, 25, has played 16 games for the Leafs this season scoring two goals and registering 19 minutes in penalties. He recorded his first NHL goal, which was also the game-winner, in the Leafs' 3-2 win at Washington on Feb. 5
The 6-foot-3, 205-pound defenseman is tied for third on the team in blocked shots with 37. He has also skated in 34 games for the American Hockey League's Toronto Marlies in 2012-13 collecting a goal, eight points and 28 penalty minutes.
Holzer, a native of Munich, Germany, has represented his country at several international tournaments including the 2010 Olympic Winter Games, the 2010 and 2011 IIHF World Championship, and the 2007 IIHF World Junior Championship.