Sunderland full-back Patrick van Aanholt played down concerns he was battling a heart complaint.
Van Aanholt was named to start his side's visit to Tottenham in the Premier League on Sunday before being replaced shortly before kick-off.
It was later revealed the left-back was withdrawn after "medical advice from cardiologists".
"I was indeed surprised, because there is really nothing to worry about," he told Voetbal International.
"I've been sick last week. I picked up a virus and that would have crept in my body, possibly even to my heart.
"We had to make a scan, but the scan is offered late or too late at the FA and therefore I had to sit in the stand.
"I felt nothing in my heart. I'm just fit."
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