Ron Dennis expects McLaren to spring a few surprises in the 2016 Formula One season as they aim to bounce back from a dismal 2015 campaign.
McLaren scored just 27 points in 19 grands prix last term as they struggled mightily after returning to Honda power units.
That performance saw McLaren finish second bottom in the constructors' standings but racing director Eric Boullier has recently said he expects the team to make "massive improvements" in 2016.
And, in an interview with F1's official website, Dennis said: "We at McLaren-Honda will not be in the hunt for outright world championship glory in 2016, but we expect to make good progress compared with 2015.
"We have been working 24-7 in Woking all winter, weekends as well as weekdays, nights as well as days, and our colleagues at Honda have also been burning the midnight oil in Sakura.
"Expenditure of effort does not guarantee success, of course, but you may rest assured that no Formula One team has been putting in more hours over the past few months than we have.
"At some point during the season, we will begin to spring a few surprises. Clearly, Honda's power unit was a significant contributor to our under-performance last season."