Italian GP: Daniel Ricciardo, Max Verstappen, Fernando Alonso and Carlos Sainz all hit with grid drops

Daniel Ricciardo, Max Verstappen, Carlos Sainz and Fernando Alonso will all serve grid penalties at this weekend's Italian GP.

Both Red Bull drivers have been fitted with a new ICE, turbocharger and MGU-H at Monza, while Ricciardo has also received a further five-place penalty for a gearbox change.

He will start the race 25 places further back than his qualifying position, and Verstappen 15.

Sainz's new MGU-H, meanwhile, is his fifth of the component so far this season and the Toro Rosso driver takes a 10-place grid drop.

Alonso: McLaren can be champions

But it is McLaren's Alonso who is likely to start at the back of the field, after receiving a 35-place penalty thanks to more Honda engine penalties.

Honda have confirmed the Spaniard's MCL32 will be fitted with a new '3.7-spec' power unit this weekend and with Alonso already well over the permitted number of components of four, a large penalty was inevitable.

More Verstappen frustration
Though Ricciardo is set to start further back than his Red Bull team-mate, Verstappen is the man who has been plagued by engine reliability issues more often this season.

A downbeat Verstappen said he was "frustrated, disappointed and just really not happy" with the situation after a Belgian GP retirement last week, having finished on the podium just once in 2017.

Despite Red Bull having said the Dutchman's contract runs to 2019, the Dutchman also called into question his long-term future at the team if the high levels of unreliability continued.

Monza, with its long straights punctured by tight chicanes, is not expected to be a circuit that plays to the strengths of the Red Bull-Renault package with the team not finishing higher than fifth since the change in engine regulations three years ago.

And Ricciardo admitted the team were preparing for a historically strong Singapore GP, claiming: "I don't want to take any risks in Singapore and race with an old engine. If we have to be strategic about it then OK.

McLaren set up Singapore attack
It is thought McLaren are also trying to take penalties now to maximise their potential for the next race in Singapore, and both Alonso and Stoffel Vandoorne should now be penalty-free at a high-downforce track that should suit their package.

Vandoorne picked up the penalties last week in Belgium, starting from the back of the grid after taking a staggering 65-place grid drop after being fitted with a 3.6-spec engine.

But it was Alonso's frustration that boiled over, with the two-time world champion claiming McLaren's straight-line speed was "embarrassing" at a track which also heavily relies on engine power.

Alonso then courted controversy after retiring the race with what he called was an "engine issue", though Honda revealed they found no problem on the car.

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McLaren, meanwhile, for whom only Renault appear to be a viable option for a fresh power supply next year, will make a decision on their engine suppliers in the next month.

But though Alonso had hinted he would leave the team once his contract expires, a remarkable U-turn at Monza has seen him indicate that he is ready to sign a multi-year contract to stay at McLaren.

"I am extremely happy here and l believe we could have the package to win a championship," Alonso said

"We will see what the proposals are," he said. "If they are very good, maybe two years could work. Maybe one year, maybe three, maybe five - l am young enough."

Alonso has also described claims he has told McLaren he will leave unless they drop Honda as "absolute rubbish".