John Harbaugh is voicing his frustrations over the guidelines sent to the 32 NFL teams outlining procedures for the full reopening of their practice facilities.

"I've seen all the memos on that, and to be quite honest with you, it's impossible what they're asking us to do. Humanly impossible," Harbaugh told 105.7 The Fan. "So, we're going to do everything we can do. We're going to space, we're going to have masks. But, you know, it's a communication sport. We have to be able to communicate with each other in person. We have to practice."

The protocol requires physical distancing in the locker, meeting and weight rooms as well as cafeterias.

"I'm pretty sure the huddle is not going to be 6-feet spaced," the Baltimore Ravens coach said. "Are guys going to shower one at a time all day? Are guys going to lift weights one at a time all day? These are things the league and the [players' association] needs to get a handle on and needs to get agreed with some common sense so we can operate in a 13-hour day in training camp that they're giving us and get our work done. That's the one thing, you can tell by my voice, I'm a little frustrated with what I'm hearing there. And I think they need to get that pinned down a little better."