Sustr, 24, played in 72 games with the Lightning this past season, recording 13 assists and 34 penalty minutes. The Plzen, Czech Republic native set career highs for games played, assists, plus/minus (+10) and penalty minutes. Sustr also appeared in 26 Stanley Cup Playoff games for the Lightning, registering one goal and two points. He scored his first career postseason goal in Game 2 against the Detroit Red Wings in the first round of the playoffs.

The 6-foot-7, 220-pound defenseman has skated in 117 career NHL games, all with the Bolts over the past three seasons, collecting one goal and 21 points. Sustr ranked fourth on the Lightning for blocked shots with 84 during the 2014-15 season. He also set the Lightning franchise record for best plus/minus (+7) in a playoff series in the first round of the 2015 Stanley Cup Playoffs against the Red Wings.

Sustr was originally signed by the Lightning as a free agent out of the University of Nebraska-Omaha on March 21, 2013.