Yankees pitcher CC Sabathia is expected to miss at least six more weeks with an injured right knee.

The left-hander was placed on the 15-day disabled list May 11. He was examined by Dr. James Andrews last week and had his knee drained. Sabathia also received a cortisone and stem cell injection Thursday to treat a degenerative cartilage condition.

The team confirmed Monday that the procedure means Sabathia likely will remain sidelined through at least the end of June, maybe longer.

The 2007 AL Cy Young Award winner is 3-4 with a 5.28 ERA in eight starts. He has allowed 10 home runs in 46 innings.

New York also is missing injured starters Ivan Nova and Michael Pineda, forcing the Yankees to go with a makeshift rotation that includes Vidal Nuno, David Phelps and rookie Chase Whitley.