Honda F1 boss Yusuke Hasegawa says the manufacturer cannot yet set a date to introduce an upgrade for its much maligned power unit but predicts changes will be made 'in a month's time'.

The Japanese firm has come under renewed pressure to bring its power unit up to speed after pre-season testing and the Australian Grand Prix F1 2017 opener exposed a lack of performance and disappointing reliability akin to its disastrous 2015 and at odds with gains achieved during a solid 2016 campaign.

With the criticism highlighted by two-time F1 champion Fernando Alonso's assertion he is driving his 'best' just to get the McLaren MCL32 close to scoring a point, Honda is going back to the drawing board in an attempt to extract more speed from the engine.

However, Hasegawa says he cannot pinpoint an exact timeframe for the upgrade, but suggests it could be ready in 'two weeks' time' or more likely in a month, around the Bahrain or Russian Grands Prix.

ANALYSIS: Super subs, Stroll's shoulders and pink helmets... it is the Australian Grand Prix Debrief!

"I cannot guarantee when we can get the power, but as soon as possible of course we will try to introduce a new specification for that," he said. "But it is not a one-day job. In a month's time or two weeks' time I would like to try, but I cannot guarantee here. As soon as I can prepare that I am happy to introduce that."

Coming amidst talk that McLaren's new management structure, headed by Zak Brown, could be considering severing ties with Honda if performance doesn't improve, the team's racing director Eric Boullier says he is prepared to support its needs but is 'not responsible' for Honda.

"As far as we are concerned we are responsible for McLaren and Mr Hasegawa-San is responsible for Honda. But as partners we also try to help and support each other, because the key secret is to be as integrated as possible. Any support we can offer or any support we can get, we will take it."

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