UCLA quarterback Josh Rosen is out for Friday night's game at Utah.
Rosen left last week's game against Washington with what was believed to be a finger injury, but the Los Angeles Times reported Friday that Rosen also has a concussion and did not travel with the team.
With the star junior unavailable, redshirt freshman Devon Modster will make his first career start. Modster completed 7 of 12 passes in relief of Rosen at Washington for 77 yards with a touchdown and no interceptions. He has attempted 15 passes this season.