Honda F1 boss Yusuke Hasegawa says no decision has been taken on when to roll out a token-upgraded engine this season, despite rivals preparing their own imminent updates.

The manufacturer has enjoyed an upturn in performance this season compared to its tough F1 comeback in 2015 with McLaren, Fernando Alonso securing a competitive sixth place finish last time out in the Russian Grand Prix.

With the Spaniard praising the step forward made by Honda over the winter, whilst admitting there is still work to be done to match rivals Mercedes, Ferrari and Renault, Hasegawa is delighted to see the double top ten lifting the spirits of the team.

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"The Spanish Grand Prix marks the beginning of a busy European summer season for Formula 1, and after the eventful first four flyaway races and a double points finish in Russia, it's good to see everyone in such high spirits and enjoying the camaraderie within the team.

"The Circuit de Barcelona-Catalunya is a technical circuit that is less strenuous on the power unit compared to the first four races, but much more stressful on the balance of the car. From a power unit perspective, it is important to have the correct amount of deployment, harvesting and throttle response, so our focus will be to deliver the best balance to suit the needs of our drivers.

With Ferrari having already used tokens for an engine update and both Mercedes and Renault plotting upgrades in the coming races, Honda is yet to determine how it plans to use its remaining 14 tokens.

"Our power unit development is ongoing and we have not yet confirmed to which races we will bring token updates, but hopefully we can fight for more points during Sunday's race."