The Canadian Grand Prix is this weekend as Formula One takes a brief break from the European stretch of the season.

There's a lot to worry about for most teams as the standings start to really take shape now that we're six races in.

Mercedes' Lewis Hamilton will be hoping to repeat his victory from last year and extend his lead over rival Sebastian Vettel's Ferrari further, while the German will be desperate to regain ground.

Red Bull will want to finally find some consistency having gone two consecutive races without a retirement for the first time this season.

McLaren will, similarly, want Fernando Alonso back on track after he finished without points for the first time in Monaco.

And then there's Haas, a team with really mixed fortunes this season.

While most teams have hopes for Canada, the US Based team are more about fears - team principal Gunther Steiner has even issued a warning to their drivers over one particular issue.

The team has upgraded their cars ahead of the race - but has only a single set for each driver. The lack of spares means they can't afford for things to go wrong this weekend.

"A very lean spares situation, to say the least," said Steiner.

"But we wanted to bring it here. Sometimes you have to make the step, or you keep dragging on.

"Everybody is aware of it, we try to manage as best as we can. No crashes this weekend!

"The spares situation with the old parts is also quite tough. We had a few crashes lately so that never helps.

"And at the same time we were planning to do the upgrade, we had both things going on, and that's how we ended up with no parts. It's one of those things."

They'll want to really hammer that message home to Romain Grosjean who has crashed twice this season, the latest of which was enough to take out two rivals and get himself a grid penalty for Monaco.

"Obviously you try to be careful," said Grosjean to Autosport. "But we are asked to drive the car 100%, so there is always a risk, it is Formula 1, and some things can happen.

"We are just going to be careful, and obviously try to keep it in one piece."

Teammate Kevin Magnussen commented on the warning, too - although he felt it wasn't a problem.

"Of course it would have been better to have loads of spare parts to feel a bit more safe," said Magnussen.

"But I'm not planning to go off the track anyway. So it should be alright."