Harry Kane was seen throwing up during an open Tottenham training session in South Korea.
Spurs put on a two-hour practice in front of 6,000 fans at the Seoul World Cup Stadium on Monday evening local time.
Winger Dejan Kulusevski went down the tunnel with what appeared to be a calf issue inside the first half an hour.
But apart from the Swede, most players seemed to be coping well in the sweltering conditions - until Conte's full-pitch runs right at the end.
Led by fitness instructor Gian Piero Ventrone, the tired squad were made to do up to 42 laps of the 105metre-long pitch, with those coming back late from international duty doing 30.
That was when the pain began as Kane was left bent double and vomiting on the side of the pitch.
New signing Ivan Perisic only watched on from the sidelines as he is not ready for ballwork yet following a calf problem.
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