The Chinese Grand Prix was a bleak return to reality for the Toro Rosso team. Pierre Gasly and Brendon Hartley came to blows at turn 14 after a miscommunication between the pair. The disappointing race leaves the team with a lot to learn before Baku.
The Frenchman conceded the team "lost massive pace" and needed to work hard to recover before the next race.
"A tough, tough weekend overall," he said. "We didn't have the pace compared to our main competitors.
"We need to understand why we lost so much performance in just a week. We have a lot of things to analyse.
"We tried a different set-up and clearly that's not the right direction to go.
"At least we know it, but I think we need to go more in details and a bit more deeply."
Although they struggled in China, Gasly acknowledged their struggles could have been track-dependent.
"The balance clearly wasn't as good as it used to be," he added.
"I think it's more maybe the track itself didn't suit with the long corners, long traction (zones)."
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