New Orleans Saints running back Alvin Kamara leaves Tuesday’s joint practice against the Dallas Cowboys early with a knee injury. Multiple reports say the initial concern for a major knee problem is avoided, but Kamara is still expected to miss significant time.

According to reports cited by outlets, Kamara has a sprained MCL. ESPN is cited as saying the injury will keep him out for about a month, and that he will likely miss the start of the regular season, including Week 1. One outlet notes that while the injury is not considered a major knee damage scenario, Kamara will require recovery time rather than a quick return.

Outlets largely agree on what happened and the injury type, while differing slightly in emphasis: some stress that a major knee injury was avoided, and others focus on the expected duration and the likelihood of missing the season opener. CBS also notes it would be only the second time in Kamara’s career that he misses Week 1.