Rantanen had been sidelined since taking a check into the boards near the team benches at Dallas on March 21. He logged 21 minutes on the ice in Game 1.
Rantanen was coming off a regular season in which he had career highs of 31 goals and 87 points. The right winger led the team with 16 power-play goals.
Game 2 is Saturday night in Calgary.
The Associated Press contributed to this report.