Sergio Perez says he was relieved to finish the Malaysian Grand Prix, a race he labelled as the hardest of his Formula One career, after battling a virus throughout the weekend.
The Force India driver was struck down with an illness ahead of the weekend, but was still able to make the final part of qualifying and finish the race in sixth place.
A physically demanding circuit, coupled with hot and humid weather conditions, makes Malaysia one of the toughest grands prix of the season. Perez admitted he felt so unwell at times he thought he may be forced to sit out the action in Sepang, but expressed his gratitude to the circuit's doctors for helping him out during the weekend.