Notre Dame star quarterback Riley Leonard returned in the third quarter of the Orange Bowl on Thursday after entering concussion protocol late the first half following a big hit. Leonard's brief absence injected some uncertainty for the 7-seed Fighting Irish in their College Football Playoff semifinal battle with 6-seed Penn State.

Notre Dame QB Riley Leonard suffered an injury vs. Penn State in College Football Playoff semifinal at the Orange Bowl.

Notre Dame quarterback Riley Leonard was ushered off the field by officials after a possible concussion in the Orange Bowl against Penn State, but returned.

No. 7 seed Notre Dame and No. 6 seed Penn State are set to revive their rivalry in the Orange Bowl on Thursday evening with a spot in the College Football Playoff National Championship on the line. This will be the first meeting between two storied programs since 2007 and just the 20th all time.

Win and you’re in. No. 6 Penn State and No. 7 Notre Dame battle it out in the Orange Bowl at Hard Rock Stadium for a spot in the National Championship Game. Kickoff is 7:30 p.m. ET on Thursday, Jan. 9 on ESPN.

Both the Notre Dame Fighting Irish and Penn State Nittany Lions entered Thursday’s Orange Bowl matchup with injury questions concerning a key player.

Penn State All-America defensive end Abdul Carter took the field as a starter for Thursday night's College Football Playoff semifinal against Notre Dame at the Orange Bowl, after days of speculation about whether he would be available.

Notre Dame football players and staff are dealing with a minor viral flu outbreak ahead of the team’s appearance against Penn State in the College Football Play

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