Indianapolis Colts Peyton Manning will be able to begin a more strenuous phase of his rehab program after doctors checked his neck and found the fusion procedure in his neck had "achieved firm fixation."

“X-ray and CT examination of the surgical area shows that the fusion performed in September has achieved firm fixation,” said Dr. Robert Watkins said in a statement. “Peyton will now be allowed to increase the intensity and breadth of his workouts as tolerated. There remains every indication that his recovery will continue. There still is no timetable for Peyton’s return to practice, which is one of many steps in his expected return to game action. He is working hard on a rehabilitation program outlined in conjunction with myself, Erin Barill and Peyton. His response to this plan in the future will dictate his return date.”

Manning found the surgeon's prognosis to be good news as the four-time MVP works toward resuming his NFL career.

“I am encouraged with what Doc had to say,” Manning said in a statement released by the Colts. “I am happy that I can increase my rehabilitation program as outlined by him, Erin and the Colts Medical Staff. I am hopeful for continued progress in this next phase of my rehab.”

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Terry McCormick covers the Titans for TitanInsider.com