Gustafsson (lower body) won't return to Friday's game versus the Capitals.
It's unclear how Gustafsson was injured, but he was ruled out for the game midway through the second period. The 21-year-old logged just 2:37 of ice time in the game. If he can't play Sunday versus the Blues, the Jets will either have to play with 11 forwards or call someone up from AHL Manitoba.