UCLA QB Josh Rosen does not make trip to Utah; Devon Modster to make first start

UCLA quarterback Josh Rosen, who will not play Friday, leads the Pac-12 Conference in passing yards (2,713), passing yards per game (339.1) and total offense (333.9 yards). (Luis Sinco / Los Angeles Times)Those scanning the field for quarterback Josh Rosen before UCLA’s game against Utah on Friday night at Rice-Eccles Stadium won’t find their target.

Rosen remained home in Los Angeles because of a concussion, leaving redshirt freshman Devon Modster to make his first career start at quarterback for the Bruins.

Rosen sustained the concussion against Washington last weekend during a game in which he was sacked four times in the first half. He left midway through the third quarter and did not…