BOSTON - Red Sox chief baseball officer Craig Breslow confirmed Saturday's assumption: First baseman Triston Casas suffered a serious knee injury Friday night and would miss the remainder of the season.

Breslow said Casas suffered a rupture of the tellar tendon on his left knee and needed surgery. The exact timeline for his return is not clear, but the road to recovery is expected to be a long timeline.

“We are still collecting information,” Breslow said. “We don’t expect him to come back this season.”

Casas was stuffed on Fenway Park fields Friday night when he tried to avoid a collision at first base in Minnesota after a knee injury. He was taken to the regional hospital where he left behind by ambulance.

“It’s a big loss,” Breslow said. "Besides we think we're going into the offensive aspect, he's a steady presence and has done some good games on the court. Besides, this personality is big and an important part of the clubhouse and team. He'll be missed in all aspects."

Casas said during a phone conversation with Cora last night that he felt the knee buckle and then hit the first basic bag on Friday night. The Red Sox and Casas immediately knew the injury was significant. Imaging showed that pat bone rupture was the only injury and that the ligament was intact.

"That's the diagnosis," Breslow said. "He has very comprehensive imaging to make sure nothing else happens. That's where we are."

Casas' latest setback marks his second major injury in years. In April 2024, he tore the cartilage in a rib cage and missed nearly four months while recovering. His 2025 season will end after just 29 games and 112 plate appearances. The 25-year-old never played on the plate, with only 3 home runs, 11 RBIs and .580 OPS hits .182. He has been limited to a total of 92 games over the past two seasons.

“It’s tough,” Breslow said. "Given that Triston has been feeling for Triston over the past few years. It seems like these injuries, they appear in unconventional ways. Unfortunately, this is a serious person that will make him long.

"He certainly struggled around the first month of the season, but that didn't change what we thought his work could be," Breslow added.

With Casas out, the Red Sox will immediately turn to a group of utility Romy Gonzalez and Abraham Toro on the first base position. Breslow said he did not envision transferring Boston's first two prospects (Roman Anthony and Marcelo Meyer) to first base, while Cora downplayed the idea of ​​designated batsman Rafael Devers.

“It just happened yesterday,” Cora said. "We'll talk, we'll look at where we're. But I think Romi and Toro, they can do the job. I really believe, so we'll roll with them."

Boston will also search for solutions for free agents and trade markets. Breslow hit the hole quickly a year ago when Casas was injured, and in a minor league deal with Tampa Bay, he had a small trade with the Cubs and signed Dom Smith with the Cubs.

"We obviously started the last offseason trying to actively throw a highly competitive team," Breslow said. "Unfortunately, it's an opportunity to explore what's available. We want to look inside and possibly outside, too.

For the moment, though, the Red Sox are grabbing shocking, devastating injuries for one of their most talented young players and unite to support him as they await surgery.

"He likes this, kid," Cora said. "He likes to show up early. We hate that, but he likes it. He likes to clean those shoes and stay here until late. He likes baseball. That's what makes him comfortable. Now, he won't have a while, but knowing him, knowing him, knowing his family and knowing the support system he has, he'll be back, he'll be better.

"These guys, they're very hard to release, have big seasons and all of that. He did a great job in the offseason and put himself in that situation. There's no way he wants to start, but he's going to play and play a lot. Now, we have to focus on post-operative recovery.