Stepan will undergo surgery later this week to repair labrum damage in his shoulder after suffering the injury during a win over the Montreal Canadiens on Feb. 23. The team expects him to be fully recovered for next season.
The 30-year-old center collected one goal and five assists in 20 games with Ottawa this campaign. The Senators acquired him in a trade with the Arizona Coyotes in December, sending a 2021 second-round pick to the West Division club.
Ottawa reportedly tried to trade Stepan earlier this season, but last month, Dorion denied the notion that the veteran wanted to play in the United States to be closer to his wife and newborn child.
Stepan spent the previous three campaigns with the Coyotes after playing seven seasons with the New York Rangers, who drafted him 51st overall in 2008.