Dutchman Robert Gesink will undergo a heart operation after suffering pain during last week's Tour of the Basque Country.
The 27-year-old Belkin rider has pulled out of Sunday's Amstel Gold race and will also likely miss July's Tour de France.
"At the Tour of the Basque Country last week, I felt pain again. Short but around the heart," said Gesink at a press conference in Schipol near Amsterdam.
"It's not the first time it's happened and it's worrying."
Gesink revealed he had been to see a radiologist who had decided he needs an operation to correct the problem.
It's not the first time he has suffered from such a condition and Gesink said he was also afflicted by hyperventilation, which could have precipitated the heart problem.
"Every time I suffered from hyperventilation, my heart raced," he added.
"It makes me worried when that happens and it affects my performances as I'm afraid something bad will happen."
Earlier on Tuesday the Algemeen Dagblad newspaper had reported that Gesink would miss the Amstel race, the first of three Ardennes Classics.
They had claimed he suffers from stress in major races which had triggered the problems with his heart beat.
Gesink retired during the fifth stage of last week's Tour of the Basque country, while in March he also failed to complete the Tirreno-Adriatico.
He previously had to pull out of the 2011 Dutch championships and the Giro d'Italia last year.
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