UCLA quarterback Ty Dieffenbach injured his left shoulder late in the second quarter on Friday night against Illinois in Pasadena, leaving the No. 4 Bruins with third-stringer Madden Iamaleava under center. With 35 seconds left in the half, Dieffenbach raced backward to evade pressure after taking a shotgun snap, was hit in the legs by defensive tackle Carter Janki as he jumped and threw the ball away, and landed hard on his left shoulder.

He remained on the ground for more than three minutes before a trainer escorted him off the field. Dieffenbach initially clutched his left upper arm before going to the sideline, and the Rose Bowl crowd greeted his return with cheers after he came back onto the field with a minute left in the third quarter, wearing his helmet. UCLA led 10-0 at the half and held a 12-6 edge late in the third quarter, according to the Associated Press, while another account put the score at 12-7 with a minute left in the third.S1S2

The injury is a second blow to the Bruins' quarterback position this season. Starter Nico Iamaleava, Madden's older brother, suffered a season-ending knee injury on Oct. 10 against Oregon. Dieffenbach, a transfer from Cal Poly, went 4-0 as UCLA's starter after replacing him and completed 8 of 13 passes for 168 yards with one touchdown and one interception against Illinois, including a 54-yard touchdown pass to Aidan Mizell.S1S2

Madden Iamaleava replaced Dieffenbach and threw two incomplete passes before the half, and he started the second half for UCLA. The Bruins dominated the first half, outgaining Illinois 252-84 in total yardage, but could not build a larger lead after Dieffenbach threw a pass that was intercepted in the end zone.S1S2