Buffalo Bills defensive tackle Marcell Dareus was excused from practice on Monday for undisclosed personal reasons after he spent the weekend in Alabama. Despite his absence, defensive coordinator Leslie Frazier spoke glowingly about the defensive tackle on Monday.

You know, he did a really good job in our last ballgame against Cincinnati, he really came along and played well for us, and we'd just like to build on that performance, and just see him continue to get better as the season goes on and we're going to need him against this team we're facing this coming Sunday. Just more of what we saw last week as we go forward.

Dareus collected his first sack of the season in Week 5 against the Bengals. However, he wasn't with the team as it returned from the bye week. He's played only 28 percent of defensive snaps for the Bills this season. Still, Frazier remains excited about what Dareus brings to the table.

"I think for us, being a new staff and all, he just, everyone has a new slate," Frazier said. "That's how we've kind of approached every player on our defense, and the slate was wiped clean from day one and that's the way we approached it. All we want Marcell to do is just build on what we saw last week. He did some really good things in the run game, had a good sack when the quarterback tried to step up. If we can build on that and just keep progressing, our defense will get better as he gets better as well, and that's a good thing for us. Really encouraged in what we saw last week against Cincinnati."