DuJuan Harris' bid for a starting spot will have to wait until training camp.

The Green Bay Packers running back recently realized he had a much bigger issue to address.

During a routine physical check-up, doctors found a "fist-sized" cyst on Harris' lung next to his heart. Harris tweeted that he is fine, writing, "It's a #blessing!!! Should be 110% very soon and back to work."

Earlier in the day, Harris posted a photo of himself after the surgery.

Coach Mike McCarthy said Harris would miss the remainder of the team's off-season work but would be ready for training camp.

"DuJuan Harris will not be available for the remainder of the off-season program," said McCarthy. "As we have stated, we have a policy in place where we don't get into specifics of injuries in regards to injuries. I'm confident that he will be ready for training camp."

Harris tweeted the note out toward the end of Green Bay's practice Wednesday. It sounded as if several of his teammates didn't even know about his procedure.

"I actually just found out a second ago," said receiver Randall Cobb.

Added running back Alex Green, "He tweeted a thumb's-up from what I saw, so I'm guessing he's doing good. Other than that, I haven't really talked to him about it."

There's one significant silver lining in having a cyst on his lung removed.

He's able to breathe as he's never breathed before.

"It was actually pressing against his lung," said Harris' agent, Dave Lee. "Now his lungs are open to breathe all the way again — at 100% again. He should be able to get more oxygen in his body and have more endurance and be able to do more as a football player now."

The cyst was not cancerous, Lee said, and there were no complications with surgery. He said Harris could be back in two weeks; the Packers will be in their final off-season break until training camp by then.

"He didn't know about it," Lee said. "He said that as a kid, he'd feel pressure on his chest in the same area but he'd always chalk it up to indigestion or something like that. So it's a blessing in disguise and it actually may make him, physically, a better player.

"He'll get more oxygen into his body and be able to make more big plays."

Harris finished last season as the Packers' starting running back and is expected to compete for that role in camp with Green, James Starks, Eddie Lacy and Johnathan Franklin. In five games last season, Harris rushed for 257 yards on 62 carries (4.1 avg.) with four touchdowns.