Johansson spent the night at Massachusetts General Hospital for tests and evaluation and was released Wednesday. He will be re-evaluated in about a week, the team said.
The collision appeared to be shoulder to shoulder, but Johansson stayed down on the ice for a while and had to be helped to his feet before slowly making his way to the locker room.
Johansson was acquired from the New Jersey Devils at last week's trade deadline for second- and fourth-round picks. He has a history of injuries that resulted in him playing only 29 games in 2017-18.