In 2015, Franzén missed the remainder of the season due to concussion symptoms after he was blindsided by a check late in a game at Edmonton by the Oilers' Rob Klinkhammer on 6 January 2015. After being deemed medically fit to return in the 2015–2016 season, Franzén would play only two games before the return of concussion symptoms and was put on the team's long term injury reserve list. Franzén's contract expired in 2020, when the NHL season was cut short by the COVID-19 pandemic.