Alexander Rossi says he is keen to take full advantage his unexpected F1 opportunity as he prepares to make his debut in the Singapore Grand Prix with Manor, but insists there is not particular aim to prove himself to Haas F1.

Set to become the first American to start an F1 race since Scott Speed competed in the 2007 European Grand Prix, Rossi replaces Roberto Merhi for five of the remaining seven races, the only exceptions being the Russian and Abu Dhabi events when he will resume his GP2 duties.

Describing the opportunity as 'surreal', Rossi says he is determined to use these races as an opportunity to show he can hold his own in F1.

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"The big thing that I've been missing for the last three years in my F1 career is actually racing," said Rossi, who has previously held reserve driver roles with both Manor/Marussia and Caterham over the last three seasons. "We have been close a few times, but it's very surreal now that it is about to happen.

"This is a major step in really firmly putting myself on the Formula One map and the radar, so I'm just focusing on doing a good job in these next five races and showing that I am capable of being in Formula One and doing a good job.

The deal with Manor, which was only concluded this week, comes after he was publically ruled out of a potential drive with the incoming Haas F1 team, with team principal Gunther Steiner saying its priority is to sign drivers with experience.

However, though this opportunity with Manor will grant him invaluable racing mileage he was subsequently lacking, Rossi says he isn't specifically looking to convince Haas to change its mind.

"My goal is to race full time in Formula One and whatever situation that is and whatever situation presents itself, I'm going to jump at with open arms. What this may lead to, I don't know but I'm hopeful that doing a good job in these five races will prove to everyone that I belong and am capable of doing it just as much as anyone else."