"He was a unique player," Batherson said. "Not a lot of guys in the League did what he did and brought what he brought. He stuck up for a lot of guys over the years, and he was great for this franchise.
"Collectively as a team, we're going to have to find ways to bring that aspect with him gone. We're going to have to figure it out pretty quick."
Top center Tim Stutzle said the Senators have to put Tkachuk in the rearview mirror and instead focus on the current team that includes players acquired during the offseason, such as forwards William Eklund and Andre Burakovsky, and goalie Samuel Ersson.
"(Tkachuk) is always a good friend to everyone on the team and obviously a really good player," Stutzle said. "But that's all. We can't worry about that. We've just got to keep playing.
"I mean, we're really excited for the new season. I think we have a really tight group, and we're going to do everything we can to win."
One order of business that may be addressed following Tkachuk's departure is the captaincy, a role Tkachuk served in Ottawa the past five seasons.
Senators general manager Steve Staois said it's possible they could enter the season without a captain. Chabot is entering his 10th full season since being selected by Ottawa in the first round (No. 18) of the 2015 NHL Draft and said it would be an honor to get the job.
"It's an important decision," said Chabot, who had 31 points (seven goals, 24 assists) in 57 games last season and averaged 22:35 of ice time. "Yet, when I look at our group and the potential players that could be our next captain here for the Ottawa Senators, it just comes naturally to all these players that we're talking about."