Notre Dame defensive lineman Rylie Mills will miss the rest of the season with a knee injury, head coach Marcus Freeman confirmed Monday.Mills, a 6-foot-5, 295-pound senior, sustained the injury during Friday’s 27-17 win against Indiana in the first round of the College Football Playoff in South Bend, Ind.The No. 7 Fighting Irish (12-1) are preparing to face No. 2 Georgia (11-2) in the quarterfinals at the Sugar Bowl in New Orleans on New Year’s Day.