NFL Free Agency Disrupted.

Contracts agreed to in principle are formalized once players pass physicals. However, per the NFL's memo, medical exams are being overhauled due to COVID-19. Teams were told to not make "official" announcements.

So Brady to TB is not yet "official" https://twitter.com/AtlantaFalcons/status/1240378614161518601

Here's how teams are handing the physical examination process under the circumstances. https://twitter.com/RealTannenbaum/status/1240376586811170817?s=20

Team doctors are preferred over "neutral" doctors in the event there's a close call, e.g., Brett Favre's initial failed physical with the Packers.

"According to Favre, [the GM] went down and told the medical staff to pass Favre and the rest is history."
https://web.archive.org/web/20060927180333/http://www.jsonline.com/story/index.aspx?id=348858