"I think [Mercedes] are a bit nervous about this one and Baku", Chandhok told Sky Sports F1's Welcome to the Weekend.
"On that side I think the test was very helpful and useful to get some laps in the auto", he said on Thursday.
Meanwhile, Daniel Ricciardo - victor in Shanghai past year - believes Renault are heading in the right direction after failing to finish his first two races with his new team.
And the internal dynamics at the Italian team are a major talking point - Vettel needs to bounce back in China to protect his position as nominal team leader after Leclerc's impressive performance in Bahrain.
"The German came into 2019 needing to bury memories of 2018, when Ferrari had the fastest auto for much of the season".More news: Behind Enemy Lines: Babcock wants more Gardiner, Tavares on the Bruins
Then there is Hamilton's Mercedes team-mate Valtteri Bottas, who leads the championship by a point from the Briton after two races and looks determined to put up a fight this season.
Fundamentally, Vettel lacked confidence in the auto in Bahrain. I expect Red Bull to be closer here than they were in Bahrain - I'm not sure what happened there. On the other hand I don't think we should draw any conclusions from only one weekend in Bahrain, so it is very hard to say. "They have not as strong a auto but they are one of the teams who can develop at a similar rate to Ferrari and us". "I think we've got a really good package as well, but they've definitely stepped up this year". I know that I can be better and I know that we have lots of races to show and prove that. "I won't go into too much detail on this but we don't require exactly the same vehicle".
"I don't think there's a need to do that".
"I've been to Bahrain many times, I know my way around, I've won quite many times there as well", he said. It's never one silver bullet or one simple action, but the drag levels we have calculated would have been 0.1s maybe in difference.
"At the moment it's clearly not just me and Sebastian [Vettel]", he said. "I could have passed him back on the next straight, but the way I judged it at that point I was going to lose more time and he was going to lose more time, so the race was very long from that point onwards. But I also know and understand that people's judgement don't go further than a week, forwards or backwards, so it [the criticism] is a part of life".