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Ferrari is set to introduce a Formula 1 power unit upgrade for this weekend's Canadian Grand Prix as it continues its bid to close the gap to rival Mercedes.

Both Sebastian Vettel and Kimi Raikkonen will receive the update, which is believed to focus on the turbo and requires a spend of two development tokens.

That would take Ferrari's total token spend to 28 and leave it with four remaining for this season.

Ferrari was the biggest spender of tokens before the start of the season with 23 and spent three more before the Russian GP.

The Scuderia suffered its worst result of the season in Monaco, scoring just 12 points as Mercedes pulled 67 points clear in the constructors' championship.

Red Bull, meanwhile, closed the gap to Ferrari to just nine points and will have the updated Renault engine for both its cars in Canada.

Honda is the only manufacturer yet to have used any tokens during the season and has 14 remaining.

Mercedes has 11 while Renault, which used three for its latest upgrade, still has 21 - the most of any manufacturer.