De la Rose, a forward born in Arvika, Sweden, was selected by the Montreal Canadiens in the second round (No. 34) in the 2013 NHL Draft after he had 13 points (six goals, seven assists) for Leksand of the Swedish Hockey League.
He came to North America for the 2014-15 season and played with Hamilton of the American Hockey League, where he had 11 points (six goals, five assists) in 37 games. De le Rose made his NHL debut Feb. 3, 2015 in a 3-2 loss to the Buffalo Sabres and got his first NHL point with an assist in a 4-3 overtime loss to the Edmonton Oilers on Feb. 12. He scored his first two NHL goals in a 5-2 victory against the Columbus Blue Jackets on Feb. 26 and finished the season with six points (four goals, two assists) in 33 games.