Namestnikov, 22, skated in 43 games with the Lightning during the 2014-15 regular season, posting nine goals and 16 points to go along with 13 penalty minutes. The 6-foot, 182-pound forward set career highs for games played, goals, assists (seven) and points (16) during the regular season. Namestnikov scored his first career NHL goal on October 13 against the Montreal Canadiens last season. He appeared in 12 Stanley Cup Playoff games in 2015, recording one assist.

The Zhukovskiy, Russia native played in 34 games with the Syracuse Crunch during the 2014-15 season, registering 14 goals and 35 points. Namestnikov represented the Crunch at the 2015 AHL All-Star Classic. He has played in 134 career AHL games, all with Syracuse over the past two seasons, recording 40 goals and 104 points.

Namestnikov was selected by the Lightning in the first round, 27th overall, at the 2011 NHL Draft.

Witkowski, 25, played in 16 games with the Lightning during the 2014-15 season, recording 15 penalty minutes. The 6-foot-2, 213-pound defenseman made his NHL debut on January 20 against the Vancouver Canucks last season. Witkowski landed 37 hits and blocked 20 shots in his 16 games with the Bolts.

The Holland, Michigan native skated in 50 games with the Crunch last season, collecting two goals and eight points to go along with 91 penalty minutes. Witkowski ranked tied for seventh on the Crunch for penalty minutes. He also skated in three Calder Cup Playoff games with Syracuse in 2015, posting one assist and four penalty minutes. Witkowski has appeared in 129 career AHL games, all with the Crunch over the past three seasons, tallying four goals and 20 points to go along with 299 penalty minutes.

Witkowski was selected by the Lightning in the sixth round, 160th overall, at the 2008 NHL Draft.