Buffalo's third round pick (67th overall) in the 2019 NHL Draft also took part in the 2020 IIHF World Junior Championship where he primarily served as the third-string goalie with Sweden. He ended up dressing for just one game as a backup netminder, but he never saw any ice-time as the Swedes ended up winning the bronze medal in the Czech Republic.
Before the season was ended prematurely in the USHL, the Fighting Saints were sitting in second place in the Eastern Conference with a 33-13-2-0 record and 68 points.
Prior to being drafted by the Sabres, Portillo led Sweden's SuperElit junior league in both goals-against average (1.99) and save percentage (.931) in the 2018-19 season.
Portillo is now expected to start his collegiate career in the fall of 2020 as he heads to the University of Michigan.