It was the well-informed journalist Elliotte Friedman at Sportsnet who released the information on Tuesday evening.
Alfredsson has been an assistant coach for the Ottawa Senators for the past three seasons, but will now reportedly choose to move to rivals Toronto.
The matches between Toronto and Ottawa are called the Battle of Ontario, where Sundin and Alfredsson faced each other four times in five years in the playoffs in the early 2000s, both as team captains.
Sundin and Alfredsson were both involved when Tre Kronor won the Olympic gold medal in Turin in 2006. Alfredsson played 17 seasons as an active player for Ottawa.
