Northwestern starting quarterback Aidan Chiles is expected to miss Saturday's game against No. 19 Iowa, sources told ESPN on Friday.
Chiles has been dealing with an upper-body injury, and his timeline for a return is uncertain. He has thrown for 1,898 yards while accounting for 23 TDs (13 passing, 10 rushing) and just one interception this season for the Wildcats (6-2).
His 80.8 QBR ranks 14th in the FBS.
Veteran backup Nicco Marchiol, a transfer from West Virginia, will make his first start for the Wildcats against the Hawkeyes. He was 6-2 as a starter with the Mountaineers and has played in 27 career games.