Cardinals defensive end tweets situation prior to Panthers gameDarren Urban

CHARLOTTE, N.C. -- J.J. Watt tweeted out Sunday morning that he had to have his heart shocked into rhythm on Thursday, but he was still going to play against the Panthers.

The veteran defensive end was listed on the injury report this week with his calf issue, but "illness" was added to the designation on Thursday. Watt missed both Wednesday and Thursday practices.

He was back at practice Friday and worked on a limited basis.

Watt tweeted that he "went into A-Fib" and had to have his heart shocked. He said he put the information out there because he had been told it had been leaked and someone was planning on reporting it Sunday.

A-Fib -- Atrial fibrillation -- is defined as a "an irregular and often very rapid heart rhythm that can lead to blood clots in the heart," according to the Mayo Clinic. It can increase the risk of stroke, heart failure and other heart-related complications.

Watt had missed the first game of the year with his calf injury but has played in the last two games. He has the Cardinals' only two sacks this season.

More to come postgame on azcardinals.com.