Callahan had 17 points (seven goals, 10 assists) in 52 games with the Lightning last season, missing time because of a degenerative back condition. The 34-year-old forward, who has one season remaining on a six-year contract he signed with Tampa Bay on June 24, 2014, was placed on long-term injured reserve June 20.
"I don't think a year off or two years off is going to help it to be honest with you," Callahan told the Lightning website in June. "From what the doctors have said and the way I feel, it doesn't look like I'm going to be able to come back. ... If it wasn't for my back, I'd be playing next year ... wherever that may be. I wanted to be with the Lightning."
RELATED: [2019-20 NHL Trade Tracker]
Selected by the New York Rangers in the fourth round (No. 127) of the 2004 NHL Draft, Callahan has 386 points (186 goals, 200 assists) in 757 games in 13 seasons with the Rangers and Lightning, and 39 points (20 goals, 19 assists) in 121 Stanley Cup Playoff games.
"I would like to thank Ryan Callahan, who worked with us to make this trade happen, but also for all the great years that he's provided for our team, the leadership he brought to our team, the on-ice play he brought to our team," Tampa Bay general manager Julien BriseBois said. "And his contributions to the community, his family raised significant amounts of money for pediatric cancer and for families going through situations with pediatric cancer. I appreciate everything he's done for our organization."
Condon was 0-2-0 with a 6.40 goals-against average and .800 save percentage in two starts for Ottawa in 2018-19; The 29-year-old missed most of last season because of a hip injury.