Carlos Sainz says his Toro Rosso team is in a race against time to repair his STR10 machine after suffering a heavy shunt in an aquaplane off in the opening phase of qualifying.

The Spaniard was powerless to stop his car spinning and careering into the inside barriers at turn three in the soaking wet conditions after skidding off the circuit in Q1, causing a brief red-flag suspension to qualifying.

The off ruled him out of returning to the action and left him anchored at the bottom of the timesheet which means he will start 20th and last on the grid for the United States Grand Prix.

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However, Sainz's participation in the race is still under some doubt as his team race to fix the car, which sustained heavy damage to its front end, and only have a couple of hours to mend it with qualifying being delayed until Sunday morning after torrential rain wrote off the action on Saturday.

"I'm disappointed, obviously. We had shown good pace in the wet during the weekend, but when I arrived to turn three there was so much standing water that I just aquaplaned, lost the car and couldn't do anything about it," Sainz said. "It's a shame that it happened at the corner where the wall is the closest to you and I couldn't manage to avoid it.

"If not it would've been a simple spin and I would've been able to continue! But this sport is sometimes like this. I'm a rookie and I just need to learn from this mistake, which will make me stronger."

Sainz has apologised to his team for giving them a huge amount of work which will be intensified by the time constraints and is already looking to make it up to them with his race performance if he is able to make the start grid for the US Grand Prix later today.

"I'm very sorry for the guys in the garage, who will now have to work against time and get the car ready for the race. We have the pace to move forward and I hope to reward the team with a good result."