Mac Mueller's shoulder injury will cost him his senior season.
The standout Rocori quarterback separated his throwing shoulder after being tackled on a punt return in the first quarter of Saturday's 2012 loss to Sauk Rapids.
He missed the rest of the game with the injury.
On Monday the injury was ruled to be season-ending.
Rocori head coach Mike Rowe said he knows Mueller is disappointed.
"Everyone wants to play their senior year," Rowe said. "I know he's extremely disappointed. For us, we have to move on. I feel bad for the kid because he's been a great player and done all the right things to deserve this opportunity to start at quarterback for his senior season.
"Unless we make a long run in the playoffs, he's done for the year and won't play."
Rowe also indicated that there was some ligament damage to Mueller's right shoulder.
The injury happened when a Sauk Rapids defender fell down on Mueller awkwardly following making a tackle.
Rowe said Mueller's focus will be getting ready for the basketball and baseball seasons.
Mueller had rushed 92 times for 573 yards with nine touchdowns this season. He had thrown for 623 yards and eight touchdowns.
"Mac was playing phenomenal," Rowe said. "We have to deal with the cards we've been dealt. Adversity is part of football. We have to rally together."
The Spartans (4-1) will turn to Brad Fabel as the new starting quarterback. Luke Asfeld will be Fabel's backup. Fabel is a 6-foot-4, 175-pound junior. He was 15 of 33 passing for 214 yards with two touchdowns and two interceptions against Sauk Rapids.
"Brad will continue to be our guy. We have confidence in him," Rowe said. "He stepped in Saturday and wasn't afraid. It's time for our seniors to lead the way and be our playmakers around him."
Rocori won the Class 4A state title last season. This year, the Spartans are facing more challenges.
Rocori is at Big Lake at 7 p.m. Friday.
The Hornets are now 1-3 in the Mississippi 8 Conference and 1-4 overall after beating Duluth East 41-36 last Friday for their first victory of the season.
"We had no adversity last year and we're getting our handful this year," Rowe said. "I think our kids will respond to this, though."