ST. LOUIS -- Both the Cardinals and Jaime Garcia are refusing to confirm or deny reports that club and player are on the verge of agreeing to a four-year contract extension through 2015.

An employee of KTRS radio, which is partly owned by the club, posted Thursday on his personal Twitter page that Garcia and the club have reached agreement on a four-year deal worth a guaranteed $27.5 million with options for the 2016 and 2017 seasons.

General manager John Mozeliak and Garcia both addressed reporters on Thursday afternoon. Neither would even confirm that discussions are ongoing, though likewise neither did they deny it.

"I can tell you that any contract discussions that we have with any player will be done privately, and when we have an announcement, we'll have an announcement," Mozeliak said.

Garcia echoed that sentiment, saying, "It's something private. I'm not saying yes or no. All I'm saying is, if there's something going on, at the time, you guys [reporters] will find out."

However, Garcia acknowledged that he finds significant appeal in the thought of a multiyear deal. He has already undergone "Tommy John" reconstructive elbow surgery and missed the bulk of the 2009 season.

"I'm not going to lie, some security is always good," he said. "But like I said, all I'm focusing about is pitching, and that's it."

Such a deal would cover Garcia's three years of arbitration eligibility, during which time he would have been under team control, as well as what would have been the first year he could have been a free agent. The option years would cover what potentially would be his second and third years of free-agent eligibility.

Garcia, who turns 25 on Friday, is in his second full year in the Cardinals' starting rotation. He's 8-3 this year with a 3.23 ERA, 95 strikeouts and 30 walks in 111 1/3 innings. For his career, he's 22-12 with a 3.07 ERA, 235 strikeouts and 102 walks in 290 2/3 innings.

The left-hander was a 22nd-round pick in the 2005 Draft. He finished third behind Buster Posey and Jason Heyward in balloting for the 2010 National League Rookie of the Year award.