McLaren-Honda racing director Eric Boullier has played down McLaren's chances of making a 'significant upturn in performance' during the Spanish Grand Prix, but insists it is united in its quest to return to the front.

Boullier had originally targeted the first European round of the 2015 season as a chance for McLaren to make a stride toward the front having failed to score a point in the first four rounds of the season, but has since played down that comment.

Indeed, though he says there are upgrades coming to the Honda-powered MP4-30 in Barcelona, he says it will take more than one upgrade to bring the car up to competitive speed.

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"We're certainly going into the beginning of the European leg of the season with a positive frame of mind," he said. "Of course, we can never be satisfied with our results until we're fighting for regular victories.

"However, I'm very pleased with our progress and the efforts of the entire team - both within McLaren and Honda - and we go to Spain hopeful that we can make further progress there.

"During the three-week break between Bahrain and Spain, we've been working very productively on every front to bring improvements to the car. We know that one fix or upgrade won't provide a significant upturn in performance, so we're united in our continued efforts to bring further gains to both chassis and power unit, in terms of both reliability and outright performance, step by step."