New York Mets closer Edwin Díaz has a torn patellar tendon and is expected to miss the entire season after injuring his right knee while celebrating a victory in the World Baseball Classic.

Mets general manager Billy Eppler said Díaz would undergo surgery Thursday. Without going into specifics, Eppler said a general timeline for recovery from this type of injury is about eight months.

"There are instances where athletes have come back earlier, more around the six-month mark," Eppler told reporters. "But those are a little bit more of the exception than the rule."

Díaz, who turns 29 next week, retired the side in order in the ninth inning Wednesday of a 5-2 victory over the Dominican Republic that sent Puerto Rico to the WBC quarterfinals. As Díaz and his teammates jumped together in the infield, the right-hander collapsed and reached for his right leg. He was taken off the field in a wheelchair.

"To see him get hurt like that, it's a sad thing for Puerto Rico, for all of baseball," Puerto Rico manager and former Cardinals star Yadier Molina said Thursday. "We wish him the best. We're praying for him, and we know he's going to come out of this stronger."

"Edwin Díaz is a great human being and a fierce competitor," Mets owner Steve Cohen tweeted. "All of us at the Mets are shaken but determined to sustain our quest for a great season. We wish Edwin a speedy recovery."

Eppler said he spoke to Díaz several times and noted that the right-hander was in "great spirits."

"He's a resilient human being," Eppler said. "That's why he's the closer he is. The dude doesn't get rattled."

The Mets signed Díaz to a five-year, $102 million contract -- the largest ever for a closer -- after he produced a spectacular 2022 season. All player contracts are covered by insurance through the WBC that spans the length of time the player is out with an injury suffered during the tournament.

Díaz went 3-1 with a 1.31 ERA and 32 saves in 35 opportunities while striking out 118 batters in 62 innings last season. He made his second All-Star appearance and finished ninth in the Cy Young Award voting.

The Mets do have relievers on their roster with closer experience as they attempt to replace Díaz.

David Robertson has 157 career saves, including 20 last season when he pitched for the Cubs and Phillies. Adam Ottavino has 33 career saves. Brooks Raley had six saves for the Rays last season.

Molina said he will decide who Puerto Rico's potential closer will be based on the game plays out and mentioned Diaz's brother, Reds reliever Alexis Diaz, as a possible option. Puerto Rico faces Mexico on Friday in the WBC quarterfinals.

"[Alexis Diaz] is a professional, and he's going to be ready," Molina said.

Tigers shortstop Javier Baez said Edwin Diaz, nicknamed "Sugar," visited Puerto Rico's clubhouse while they were awaiting the MRI results to talk to the team and try to motivate them for the rest of the tournament.

"We're going to do this for our country, and also for Sugar," Baez said. "I can't express to you what that clubhouse feels like. It feels super motivated by what happened yesterday -- to win for Sugar."

Eppler didn't have details on exactly what caused the injury during the WBC postgame celebration but said torn patellar tendons happen more often in other sports.

"It's an injury that's actually really common in the NBA and NFL," Eppler said. "When you get excessive load put on your knee, it can happen."

ESPN's Alden Gonzalez and The Associated Press contributed to this report.