BELGRADE, Serbia -- Serbian rower Nemanja Nesic died Wednesday during a training session, a senior official with the country's rowing federation said. He was 24.

General secretary Nebojsa Jevremovic said Nesic collapsed during a morning practice in his hometown of Smederevo, east of the capital Belgrade. Jevremovic said a rower, who was training with Nesic, and his coach, rushed the athlete to shore, where a medical team was waiting. They could not revive him.

Jevremovic said Nesic had regular medical checkups -- the most recent five weeks ago -- and there was no indication that anything was wrong with his health.

"There was no sign at all that a tragedy like this could happen," Jevremovic said. He did not give the cause of death, but said an autopsy is being performed.

"He was a top sportsman," he added. "We are in shock."

Nesic was training in the lightweight double sculls for the World Rowing Cup in Munich next week.

He failed to qualify for the London Games, Jevremovic said.

Nesic's career best was a bronze in fours at the European Championship last year in Bulgaria.