McKinnie arrived in Baltimore on Sunday after missing the Ravens' first three practices of training camp. He was removed from the restricted/did not report list today, but since he still can't practice, he'll land on either the physically unable to perform list or the non-football injury list.
Harbaugh said that McKinnie "started the process of getting his physical finished up this morning.
"He and I had a long conversation, a good conversation," Harbaugh continued. "Like I've said many times, I think the world of B-Mac. I do believe he's a hard worker. I do believe he's been working hard, but he's not ready to practice yet. When he's ready to practice, he'll be out there."
McKinnie, who has battled weight issues throughout his career, has told people that he didn't report to camp because he hurt his back in an accident at home.
“He strained a muscle in his back," Harbaugh said. "I didn’t ask how he did it. I think he said he fell and strained a muscle in his back.”
“My first thought right now is it’s going to be a competition," Harbaugh said. "We’re going to put the best five guys out there. It’s become a competition. It’s not ideal in the sense that I’d love for Mike to be settled on one side or the other, but by the same token, that’s what it is. We’re going to play our best five guys.”
In other injury news, rookie outside linebacker Courtney Upshaw missed practice with a bruised shoulder and is "out for now," according to Harbaugh. Second-year cornerback Jimmy Smith returned to practice today after sustaining a shoulder bruise in practice Saturday.
Harbaugh said that defensive tackle Haloti Ngata, who tweaked his hamstring during the conditioning test and is yet to practice, is "making strides" but still has to pass the conditioning test and prove he's 100 percent healthy.
Defensive end Pernell McPhee, who also hasn't practiced after having his knee scoped this offseason, has started working on his lateral movement and is "nearing" a return. The Ravens are optimistic that he'll be ready by the first preseason game next Thursday.
While tight end Dennis Pitta sustained the most significant injury in today's practice with what is feared to be a broken hand, nose tackle Terrence Cody (foot), linebacker Josh Bynes and wide receiver Devin Goda also didn't finish practice.
Second-year wide receiver Tandon Doss (hamstring) also sat out practice.