CC Sabathia's 15-day DL stint is going to turn into something much longer than just a couple of weeks. Speaking on ESPN The Magazine's Buster Olney's podcast, Yankees General Manager Brian Cashman revealed that his big left-hander probably won't see a Major League mound again for "at least six weeks" because of a breakdown of cartilage on his right knee.

Joe Girardi had told the media on Sunday that he didn't think know when Sabathia would be back, saying that it would likely be more than 15-days, and now we know it'll be much longer than that.

Cashman said predicting anything less than six week, around July 1, would be a risky decision.

"If we predict anything before six week, we're probably setting ourselves up for disappointment." Cashman said.

Even when Sabathia does get back on the mound, he'll need to rehab back from that, so really we have no clue when we'll see Sabathia, who was place on the disabled list on May 11, one day after giving up three homeruns in a start against the Milwaukee Brewers.

Sabathia is still walking around on crutches, and, according to Cashman, needs to keep any weight off his knee for a period of time before beginning pool exercises. From there, he'll slowly work through strengthening the knee.

The Yankees, obviously, now need to start looking at way to upgrade their starting rotation. There could be several pitchers on the market that the Yankees might try to target. Yankees managing partner Hal Steinbrenner recently said that the Yankees are willing to spend money in order to bring in rotation upgrades.

Cashman said that the Yankees probably won't be making any trades, though, until after the June 5 draft. So help might not be on the way any time soon.

The Yankees have already called up Chase Whitley, and he looked pretty good in his MLB debut against the New York Mets last week, and might make a few more starts, unless he really stick at this level. And who knows, maybe is Manny Banuelos, who has recently began throwing up to four innings in starts, stays healthy, we could see him up sooner than expected.

Other injury notes: Carlos Beltran received a second cortisone shot in his right elbow, and the Yankees are hoping that it'll take so he won't have to miss much time. He's going to meet with Dr. Andrews on Tuesday for a second opinion on the bone spur diagnosis that he originally got. Girardi has said that Beltran is starting to feel better, but we really don't know that until hearing if the shot takes and how his doctor visit goes on Tuesday.

If Beltran ends up needing surgery to remove the bones spurs, he could be out for six-to-twelve weeks.

Assuming all goes well, Shawn Kelley could rejoin the team this weekend during the Yankees' trip to Chicago. Kelley is scheduled to play catch today and tomorrow, then throw a bullpen session on Wednesday, then round out his rehab by making an appearance in a minor league game. His return could finally spell the end of Alfredo Aceves' stay in the Bronx, after he played a big part in the Yankees' Game 2 loss in Sunday's doubleheader.

Twitter: @GavinEwbank