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Ferrari is set to introduce an upgraded Formula 1 engine for this weekend's Italian Grand Prix, Autosport understands.

The Italian outfit has three development tokens remaining and has been working hard at Maranello to get an update ready for its home race at Monza.

It is believed Ferrari is not expecting huge gains from the update but it is hopeful it will be a small step forward as well as aiding development for next season.

Kimi Raikkonen and Sebastian Vettel are expected to run the new spec during Friday practice.

Customer team Haas will also fit the updated unit to both Romain Grosjean's and Esteban Gutierrez's cars.

However, Ferrari's other customer Sauber is set to stick with its current power unit package because of where it stands in its current cycle of engine components.

Ferrari's upgrade comes a week after Mercedes used five tokens on upgrading its power unit for the Belgian Grand Prix.

It is unclear at this stage how many tokens have been spent or which areas of the power unit have been upgraded for this weekend.