[4] In his final season of minor ice hockey with the Barrie Jr. Colts, Foerster had 20 goals and 61 points in 34 games.

[13] With the hiatus of the OHL due to the ongoing pandemic, Foerster attended the Flyers training camp in preparation for the 2020–21 season.

On January 13, 2021, he was re-assigned by the Flyers to AHL affiliate, the Lehigh Valley Phantoms training camp, in order to continue his development.

[19][20] On March 26, after scoring three goals over a total of eight games played, Foerster was loaned back to the Flyers' AHL affiliate Phantoms.

[21] Foerster was named to Team Canada for the 2022 World Junior Ice Hockey Championships, winning gold.