Sharks forward Logan Couture, who played junior with Ottawa of the Ontario Hockey League, said he expects the city to embrace Karlsson's return in similar fashion.
"I think they'll cheer him. And I think they should cheer for him," Couture said. "I'm sure the split wasn't what both sides wanted but that's the way it works in pro sports sometimes. He gave them everything he had for nine, 10 years, took them to the conference finals … they should celebrate him."
San Jose general manager Doug Wilson, an Ottawa native, agrees.
"Whatever the dynamics were that led to the trade, given how he played there and what he did for the community, I think the city will respect everything he did there," Wilson said. "He's a special guy."
Karlsson has had a slow start in San Jose, getting seven assists and no goals in his first 18 games.
Wilson said that's understandable, given the change of teams, time zones and lifestyles. But he's been impressed by the improvement shown by the veteran defenseman, who has two goals and six assists in his past seven games.
"I find his situation very relatable on many fronts from my playing days when I left [the Chicago Blackhawks] after 14 seasons and landed in San Jose," Wilson said. "It was my wife's hometown. A lot went into that: The support system, creature of habits, having played in one place, all of that.
"We knew the integration time would take some time for him. He's a great player. It was very similar to P.K. Subban going to [the Nashville Predators]. It takes some time. He's a great addition for our team. We think our best hockey is ahead of us and we think Erik's best hockey is ahead of him."
Karlsson has business to take care of before he and the Sharks head to Ottawa. After a 3-2 overtime loss to the Buffalo Sabres on Tuesday, then play at the Toronto Maple Leafs on Wednesday (7:30 p.m. ET; SN, TVAS, NBCSCA).
"I'm not the type of guy who dwells in the past or looks in the past," he said. "I'm not the type of guy who looks at what ifs. I'm just looking forward to it.
"I feel great. My body feels great. The game is starting to take form. My body might not be the same from when I was 21, but I'm a better player than when I was 21."