Colorado quarterback Jordan Webb and former offensive lineman Alexander Lewis were charged with second-degree assault after the two were arrested early Saturday morning.
Lewis, who is transferring to Nebraska, also was charged with two counts of harassment, the Denver post reported Sunday.
Webb was the primary starter at quarterback last year for Colorado, throwing for1,434 yards with eight touchdowns and eight interceptions. He suffered a torn ACL in the spring but was expected to return at some point this fall.
"Jordan's exact involvement in this incident is still being investigated," Buffaloes coach Mike MacIntyre said. "We continually stress the importance of appropriate behavior to our players and do not tolerate any detrimental conduct in our football program. Once all of the facts come to light, if Jordan is found responsible for any misconduct, he will be disciplined according to team rules."
Lewis started 12 games last season but did not practice in the spring after shoulder surgery. He had announced his decision to transfer on Friday.
"As for Alex Lewis, as of Friday he was off of the team when he did a media interview and announced that he is transferring to Nebraska," MacIntyre said. "Since he is no longer a Colorado Buffalo, it will be up to Nebraska to decide what discipline he might face."