HOUSTON (AP) -- Mets closer Francisco Rodriguez has a torn thumb ligament in his pitching hand sustained during a fight with his girlfriend's father at Citi Field and will need surgery that will sideline him for the rest of the season.

The Mets announced the injury before Monday night's game at the Houston Astros. They said the reliever didn't travel to Texas with the team.

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"Obviously I'm disappointed, discouraged, frustrated," Mets manager Jerry Manuel said. "When you get this kind of news it's ... we've just been through a lot. We seem to continue to have difficulties keeping things from -- having these type of injuries or these type of setbacks. Every year it seems like we get a little something here or there."

Manuel didn't dispute that Rodriguez will miss the rest of the season but said he didn't know how much longer beyond that it will take for the reliever to recover.

Rodriguez was suspended for two days without pay following the fight outside a family room at the ballpark last Wednesday.

The 28-year-old reliever was arrested and charged with third-degree assault and second-degree harassment. He was released on his own recognizance and is due back in court Sept. 14.

When asked whether the injury occurred during the altercation, Manuel responded: "I was told during that time frame, yes." He said he does not think Rodriguez is contesting when it happened.

K-Rod was examined Monday at the Hospital for Special Surgery in New York, and the Mets said an MRI revealed the injury in his right hand.

"It's a very tough one," Manuel said. "It's not a baseball-related thing so that even probably adds to it a bit."