Six-time Super Bowl-winning quarterback Tom Brady was seen training in a park which had been closed due to coronavirus.
The former New England Patriot is now in Tampa, Florida, after signing for the Buccaneers during the post-season.
Mayor Jane Castor told a news conference a warden saw someone working out in a park near the city centre.
"She went over to tell him that it was closed and it was Tom Brady," she said.
The City of Tampa tweeted: "Sorry @TomBrady! Our @tampaparksrec team can't wait to welcome you and our entire community back with even bigger smiles - until then, stay safe and stay home as much as you can to help flatten the curve."
Meanwhile, three days before the NFL draft will be held over internet connections and phone lines, the league staged a relatively successful test run on Monday, according to Denver Broncos general manager John Elway.
The first overall pick by the Cincinnati Bengals was delayed significantly due to technical issues before the process began running as intended.
"The draft went smooth, it got off to a little bit of a hiccup when we first started, but other than that it went really smooth," Elway said. "There were really no problems with it, so we got comfortable with it.
"It should be fine and go on without a glitch. I'm sure there will be a couple glitches, but for the first time, I thought it went pretty well."
According to ESPN, there was a 2 1/2-minute delay for the Bengals' top pick,though earlier reports listed the interruption as lasting longer.
NFL front-office personnel also learned about the pitfalls of dealing with the draft while sharing the home wifi with family members. With all NFL facilities closed due to the coronavirus pandemic, draft participants will all be on their own as opposed to huddling in the traditional "draft war rooms".
ESPN's Dianna Russini tweeted, "I was on the phone with a head coach talking about the mock draft today and he was losing his mind because his Internet went down... apparently his young children were all on their iPads using up the bandwidth. 'Everybody get off the Internet' in loud dad voice. I hung up."
Elway sees the possibility of fewer deals in this year's draft.
"It will be interesting to see. The mock draft we had (Monday), everything was kind of predetermined, so it made it a little easier than I think it's going to be," Elway said. "Obviously, the time constraints, being virtual and not having everybody in the same room makes it more difficult, so that may lead to less trades.
"I still think there is going to be trades, if anything it makes us prepare a little bit harder to have an idea at each position of where we are right now... (to know) what the compensation may be."
