Sebastian Vettel has questioned how much Lewis Hamilton is enjoying racing amid his struggles in the 2022 Formula One season.
Hamilton, a seven-time world champion, and Mercedes have battled issues with the new design of their car during the early throes of the campaign.
The 37-year-old has just 50 points to his name in the drivers' standings, and sits 75 behind leader and defending champion Max Verstappen heading into the Azerbaijan Grand Prix.
Hamilton has just one podium finish this campaign, a third-place finish at the Bahrain Grand Prix opener, from seven races as Mercedes have failed to keep the pace with Red Bull and Ferrari.
Aston Martin driver Vettel pondered whether Hamilton is still getting the same joy he previously did.
"He had a package where he was able to win," four-time world champion Vettel said. "Obviously, it's been a little different for myself the last few years, but that's how it goes sometimes.
"You still try to make the most of it, but for sure, in terms of how much you enjoy it, when you get used to winning there is no feeling that can replace that.
"But having said that you have to work together as a team to try and get back up."
Mercedes have repeatedly struggled with 'porpoising' – bouncing at high speed – and not racing at the optimum height with their W13 car.
That has left them in the wake of a dominant season so far for Red Bull and Ferrari, and Vettel acknowledged the difficulties as he suggested Aston Martin are having problems of their own.
"I don't think Mercedes pulled back voluntarily; I think they are obviously having difficulties extracting the most from their car just like many other people have," he added.
"But others that have got it together more so the balance has shifted a little bit. But for us that’s not what is most important, the most important is about looking at ourselves where we are.
"And as I said at the moment, we are not happy with where we are, we would like to be further up but there’s a lot of work going into the project and hopefully we will see some better results soon."
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