Twins pitchers and catchers are not scheduled to report to spring training in Fort Myers, Fla., until next week, and the team already is down a man.

Right-handed reliever Anthony Swarzak will be sidelined about a month after fracturing two ribs on his left side horsing around with friends during TwinsFest, according to general manager Terry Ryan.

The injury occurred Jan. 25, but Swarzak was not diagnosed until he saw a doctor this week near his home in Fort Lauderdale, Fla. He notified the club Monday, Feb. 4, Ryan said.

"It's unfortunate, disappointing, all that stuff," Ryan said Wednesday. "He came up here for TwinsFest and got together with some friends at a house after hours; there was some horseplay. It was painful at the time, but he thought it would eventually correct itself. When it wasn't getting better, he had it checked out.

"He was forthright, which I appreciate. But he'll be behind in spring training."

Swarzak, 27, was penciled in for a role in the bullpen, where he spent most of 2012. He finished 3-1 with a 4.05 earned-run average in 73 1/3 innings as a reliever and 0-5 with an 8.10 ERA in 23 1/3 innings in five starts.

The Twins' 2004 second-round pick, Swarzak debuted May 23, 2009, with seven shutout innings to earn a victory over the Milwaukee Brewers at the Metrodome.

In 83 career appearances, Swarzak has a 10-20 record and 5.03 ERA with 151 strikeouts and 77 walks.