Pierre Gasly has said he is struggling to “understand” Toro Rosso’s dip in form but added that it is not all down to Honda.

Gasly delivered one of the performances of the season so far with his P4 finish in Bahrain, but the Frenchman and team-mate Brendon Hartley have delivered just one point between them since.

Gasly does not have the answers for Toro Rosso’s slump, but said that the chassis, not just the engine, needs improvement.

“It’s difficult, really, because the last two weekends have been really tough in terms of performance,” Gasly said via Autosport.

“We knew that China has one of the longest straights of the season, Baku as well.