Miller said his shoulder doesn't bother him while throwing but that he sometimes feels some discomfort lifting or stretching, which isn't unusual.
"It normally takes awhile," said Miller, who should know. "I did the same separation on my left shoulder in college. It took me a year-and-a-half to recover from it. It just never healed right. Then I did the same thing to this one. Because of all the throwing and (because) there's a lot of muscle that was already there, it probably made me bounce back a lot quicker."
Miller should be completely healthy by training camp, which is tentatively scheduled to open July 25 with two-a-day practices starting July 26.
If Miller continues to have problems then free agent acquisition Chris Chandler will be ready to step in.
"Hopefully, we go 14 and 2 and I never get to step on the field," Chandler said. "But, I have to prepare like I'm one play away (from getting in the game) and I'm gong to play in every game."