According to Lightning reporter Bryan Burns, Cernak reached out to Dahlin on Tuesday via text message to apologize for the incident.
Dahlin had been off to a solid start in his sophomore campaign. He's tallied 16 points in 24 games and ranks second on the Sabres with 15 assists.
As a rookie in 2018-19, Dahlin became just the third 18-year-old defenseman in NHL history to record 40 points in a season and finished third in Calder Trophy voting.
The Sabres now have five regulars on the injured list - including fellow blue-liner Jake McCabe - heading into Wednesday night's tilt against the Calgary Flames.