Starting center Matt Birk is out three to four weeks after having minor knee surgery, and Casey Rabach won't be joining the Ravens after failing his physical.
But don't expect the Ravens to go after Olin Kreutz or Shaun O'Hara.
"Matt will be our starting center," coach John Harbaugh said. "I don't think he necessarily needs training camp. That's my feeling. Let him get this cleaned up right now, and we'll get a week or two of training camp with him, and he'll be ready to play."
Birk, 35, had surgery Tuesday to clean out the bursa sac in his left knee. If Birk didn't...