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The Haas Formula 1 team has decided to run the new-spec Ferrari engine at next weekend's Spanish Grand Prix, Autosport has learned.

Ferrari used three of its engine development tokens as part of an upgrade that it introduced for its works team at the Russian GP.

Haas team principal Gunther Steiner said at Sochi that the American outfit was unsure whether it would use the new spec at Barcelona.

But following discussions at its factory, it has now chosen to introduce the upgraded engine from Spain as it fits in with its schedule for the rest of the season.

Haas follows fellow Ferrari customer Sauber, which has chosen to run the same spec at Barcelona, as revealed by Autosport earlier this week.

Romain Grosjean scored points for the third time in four races with eighth in Russia and believes the upgrades due on both the car and engine in Spain will be a further boost.

"I'm very much looking forward to going back to Barcelona now," he told Autosport at Sochi.

"We should have updates on the car as well and a new engine. It's all looking good. I'm pretty optimistic."

Grosjean revealed that Haas thinks it has got to the bottom of a problem he had encountered over the course of the Russian GP weekend.

"Something is not going quite right on the car," he said. "On Saturday night, we put the finger on what could be going wrong.

"So I'm very much looking forward to changing those parts and going to Barcelona and a track we know."