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.

It's time for College Football Playoff Orange Bowl semifinal. Follow along for live score and game updates between Notre Dame vs Penn State:

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.

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.

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.

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

Notre Dame quarterback Riley Leonard left the game with an injury, while Penn State's run game is dominating.

Notre Dame vs. Penn State in CFP Semifinal Orange Bowl at Hard Rock Stadium. Follow along for live scoring updates

Notre Dame heads to halftime down 10-3 against Penn State and perhaps without its starting quarterback for the second half