At the 2022 Ontario Hockey League (OHL) draft, Sennecke was selected eighth overall by the Oshawa Generals.

[1] He scored his first OHL goal in the first game of the 2022–23 season, a 2–1 victory over the Barrie Colts on September 29, 2022.

In the playoffs, he added 10 goals and 22 points as the Generals made a run to the OHL finals.

[8] On September 5, 2024, Sennecke suffered a fractured foot during off-season training and is expected to miss six to eight weeks.

[10] Sennecke is the son of interior designer, television personality, and former Canada women's national volleyball team member Candice Olson and her husband Jurij.