The Jets might be without defensive coordinator Kacy Rodgers against the Broncos on Sunday after the coach fell ill.
Rodgers missed practice Friday after missing his regularly scheduled weekly press conference on Thursday.
"He's ill of a nature we can't discuss right now," Bowles said after practice Friday. "We'll see going forward where he is and go from there. ... He's a tough guy. It's a serious thing."
Bowles was uncertain whether Rodgers would be with the team this weekend.
Rodgers' family told the Daily News that he's under a physician's care, but they're expecting him to be fine. There will be more clarity in the coming days after additional tests.
Bowles and Rodgers have been on the same coaching staffs for three teams (Cowboys, Dolphins and Jets) dating back 13 years.
