Jean-Eric Vergne says Toro Rosso understands why its upgrades did not work in China

The team introduced several upgrades for last weekend's race at Shanghai, but struggled to make them work properly and its form dropped in comparison with the previous races.

Vergne finished the race in 16th position, with team-mate Daniel Ricciardo one place further down.

The Frenchman, however, says Toro Rosso has understood the reasons why the upgrades are not working and he is hopeful the situation can be improved.

"I think that the team is trying to understand. I mean I think the team understood but they are trying to fix the new aero package we had in China," said Vergne.

"I think it worked and I think they have a good solution so that is why we are going to find more."

Vergne admitted the Chinese GP was a struggle for him.

"It was quite obvious that behind the wheel I was not feeling comfortable," he said.

The former British Formula 3 champion, who scored his first points in Formula 1 in the Malaysian Grand Prix, said it was hard to be satisfied with his performance so far.

"I don't know, it is quite hard to be satisfied," he said. "To be honest I am not looking at the first few races and I am not thinking about it and it makes no sense for me to judge myself. Maybe some others can do it but it makes no sense for me to judge.

"At the end of the season I will look but I just want to do good races and to score more points and that's it. I have an easy mentality."