Lewis Hamilton said his Mercedes feels like it is "getting worse" after struggling in Friday's two practice sessions ahead of Sunday's Canadian Grand Prix.

Hamilton is in the unfamiliar position of sixth in the drivers' championship, already 88 points behind rival and defending champion Max Verstappen eight races into what has been a tough 2022 campaign so far.

The seven-time world champion finished fourth last week in Azerbaijan, with team-mate George Russell claiming third, but called the race the "most painful" of his career after suffering severe back pain throughout.

Hamilton's discomfort, which saw him struggle to exit his car after finishing, was caused by the team's W13 car porpoising, bouncing unevenly.

The FIA confirmed on Thursday it had issued a technical directive to teams to provide guidance on how the porpoising problem will be dealt with in future, with a number of drivers complaining about its effects.

But Mercedes have continued to struggle in Montreal.

Following Friday practice, Hamilton summed up his day: "Pretty much like every Friday for us, trying lots of different things, an experimental floor on my side which didn't work.

"Nothing we do generally to this car seems to work, so we're trying different set-ups; me and George went with much different set-ups in this P2 just to see if one way works and one way doesn't. I'll wait to hear how it felt for him, but for me it was a disaster.

"It's like the car's getting worse, it's getting more and more unhappy the more we do to it. I don't know, we'll keep working on it; it is what it is. I think this is the car for the year, so we'll just have to tough it out and work hard on building a better car for next year."

Having won each of the past eight F1 constructors' championships, Mercedes are third in the 2022 standings, behind leaders Red Bull by 118 points.

"It's not the Montreal that I know, that I'm used to and that I've experienced in my career,” Hamilton added. "It's the worse that I've ever felt any car here, so I'm hoping overnight we can try and make some changes.

"But fundamentally, it's just the fundamentals of the car, it is what it is. It's going to be a struggle.

"It's just a monumental fight the whole time to keep it out of the wall.

"When it bounces, when the car leaves the ground a lot, and then when it lands it grips up and it goes in different directions, and you're just trying to catch a car that jumps, hops, grips, hops, grips... it's tough, it keeps you on edge. And there were some big hits today. We've raised the car, but it doesn't make a difference."

Mercedes pushed Lewis Hamilton too far during the Azerbaijan Grand Prix, the team's head of strategy James Vowles has admitted.

Seven-time world champion Hamilton finished fourth in Baku, with team-mate George Russell claiming third, but called the race the "most painful" of his career after suffering severe back pain throughout.

Hamilton's discomfort, which saw him struggle to exit his car after finishing, was caused by the team's W13 car porpoising – bouncing unevenly – and led team principal Toto Wolff to initially suggest the 37-year-old could miss the upcoming Canadian Grand Prix. 

While Hamilton has since quelled those fears by saying he "wouldn't miss it for the world", Vowles said the team had pushed him too far in the last race and could not afford to do so again.

"[Lewis] is an elite athlete that will push the bounds of endurance of himself and the car", he told Mercedes' YouTube channel. "That's what Formula One drivers do, that's what makes them exceptional.

"On this occasion, though, we pushed the package and our drivers too far, we are putting them into significant discomfort and we simply can't do that again. 

"Our drivers are not the only ones suffering, you will see in the media a number of comments from a number of drivers who are equally in discomfort and pain. And we have a responsibility now to make sure that this doesn't carry on."

Having won each of the last eight F1 constructors' championships, Mercedes sit third in the current standings, trailing leaders Red Bull by 118 points eight races into the 2022 campaign.

While Vowles acknowledged Red Bull and Ferrari remain the "benchmark", he believes Mercedes could narrow the gap to the leaders in Montreal.

"We didn't expect perhaps to drop back as much as we did in Baku, but that provided a platform to learn from," he added. 

"Montreal isn't going to be substantially different to the last two races, I think we will still have a package that isn't at the front on merit. Red Bull and Ferrari will still be the benchmark that we have to compare ourselves to.

"I think though that the large gap that you saw in qualifying in Baku perhaps won't be that big in Montreal – it will be back down from where it was and as we go through all the races from then onwards, I am fairly sure we will find small steps and developments that push us back towards the front."

Lewis Hamilton has declared himself fit for the Canadian Grand Prix despite a back injury suffered in Baku, stating he "would not miss it for the world".

Seven-time world champion Hamilton finished fourth at the Azerbaijan Grand Prix, but repeatedly struggled with his Mercedes W13 car porpoising – otherwise known as bouncing unevenly.

That issue combined with the bumpy street circuit of Baku caused severe back pain for Hamilton, who described the race as the "most painful" of his illustrious career.

Mercedes team principal Toto Wolff suggested his star driver may be unable to feature in Montreal due to the injury, adding there was a "definite" risk of him missing out.

However, Hamilton took to Instagram on Monday to confirm his participation in Canada, with practice starting on Friday.

"Good morning world," Hamilton wrote on his Instagram story.

"Yesterday was tough and had some troubles sleeping but have woken up feeling positive today. Back is a little sore and bruised but nothing serious, thankfully.

"I've had acupuncture and physio with Ang and am on the way to my team to work with them on improving [the car]. We have to keep fighting. No time like the present to pull together and we will.

"I'll be there this weekend, wouldn't miss it for the world. Wishing everybody an amazing day and week."

Hamilton sits sixth in the drivers' standings with 62 points, some 88 points behind Red Bull's Max Verstappen, who is on course for back-to-back titles.

There will be no Canadian Grand Prix in Formula One in 2021, with the series instead heading to Turkey in June.

Montreal had been set to host the event across June 11-13, but travel restrictions relating to the coronavirus pandemic have dictated a change in plans.

The Azerbaijan Grand Prix is scheduled for the week prior and Canada currently imposes a mandatory 14-day quarantine.

The COVID-19 crisis saw last season's Canadian Grand Prix cancelled, too, but F1 has agreed a two-year extension, meaning the race will return in 2022.

In the meantime, the Turkish Grand Prix has been restored to the calendar.

It was on the slate in 2020 and saw Lewis Hamilton's latest title triumph confirmed with victory in Istanbul in November.