Erne was selected by the Tampa Bay Lightning in the second round (No. 33) of the 2013 NHL Draft after he had 72 points (28 goals, 44 assists) in 68 games with Quebec of the Quebec Major Junior Hockey League. On April 1, 2014, Erne signed an entry-level contract with the Lightning.
Erne finished second on Quebec with 86 points (41 goals, 45 assists) in 60 games in 2014-15 and won the Guy Lafleur Trophy as QMJHL most valuable player.
Erne was selected by the Tampa Bay Lightning in the second round (No. 33) of the 2013 NHL Draft after he had 72 points (28 goals, 44 assists) in 68 games with Quebec of the Quebec Major Junior Hockey League. On April 1, 2014, Erne signed an entry-level contract with the Lightning.
Erne finished second on Quebec with 86 points (41 goals, 45 assists) in 60 games in 2014-15 and won the Guy Lafleur Trophy as QMJHL most valuable player.
The following season, he began with Syracuse of the American Hockey League and had 29 points (14 goals, 15 assists) in 42 games. He was recalled by the Lightning on Jan. 2, 2017 and made his debut the next night against the Winnipeg Jets. He scored his first NHL goal on Mar. 3 in a 5-2 loss to the Pittsburgh Penguins. In 26 games, he had three goals.
In 2017-18, Erne began the season in Syracuse, where he had 26 points (12 goals, 14 assists) in 41 games. He was recalled by the Lightning on Feb. 8 and scored a goal that night in a 5-2 win against the Vancouver Canucks. Erne finished the season with four points (three goals, one assist) in 23 games.
