The trade of Hoffman, 28, from Ottawa came a week after a report by the Ottawa Citizen claimed Melinda Karlsson, the wife of Senators defenseman Erik Karlsson, had filed an application for a peace bond against Hoffman's girlfriend, Monika Caryk, alleging harassment and cyberbullying that occurred last season and continued after the Karlssons' son, Axel, was stillborn.
Hoffman has denied the allegations.
Karlsson was traded to the Sharks on Sept. 13.
"I had some good relationships on that team," said Hoffman, who had 230 points (107 goals, 123 assists) in 342 games with the Senators. "I was there for a long time, played with some of those players for a lot of years. I definitely stay in contact with a few of them."
The game Sunday will be the first of four between the Panthers (5-5-3) and Senators (7-7-3) this season. Hoffman's first game back in Ottawa is Nov. 19.
"Obviously being in the same division, we're going to play each other a few times," Hoffman said. "Looking forward to the first one."