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Arizona Cardinals defensive end JJ Watt will play in Sunday's NFL game against the Carolina Panthers despite suffering a heart scare this week.
Watt, 33, revealed on Twitter that he went into 'A-fib' - an irregular, often rapid heart arrythmia - on Wednesday.
"I had my heart shocked back into rhythm on Thursday and I'm playing today. That's it," added the three-time NFL defensive player of the year.
Watt is in his second year at Arizona after joining from the Houston Texans.
He was listed as absent with a "calf/illness" problem on the Cardinals' injury report after missing the team's practice sessions on Wednesday and Thursday.
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In his tweet, Watt said he had only publicly disclosed the issue because he believed information about his condition had been leaked.
A-fib is the shortened name for atrial fibrillation - a disease of the heart's chambers often characterised by a faster heartbeat.
The Cardinals, who have lost two of their opening three games of the season, play the Carolina Panthers at 21:05 BST on Sunday.