Jenson Button is "confident" McLaren will once again improve in Monaco but reckons it will only be a "small step" forward.
Last time out in Barcelona, armed with several upgrades for their MP4-28, McLaren succeeded in getting both cars into the top-ten for only the second time this season.
Hailed as an improvement by the team, the 33-year-old is hoping that this weekend in Monte Carlo they can once again "chip away" as McLaren attempt to fightback.
"Everyone at McLaren has been working flat-out since the Spanish Grand Prix," said Button.
"We're not yet where we want to be in terms of competitiveness, but I'm confident that we can make another small step forward in Monaco.
"We'll continue to chip away at the performance of the MP4-28 until it's capable of challenging at the front; there's no other agenda for a winning team like McLaren.
"The aim for Monaco is to get both cars home in the points, as we did in Barcelona."
The Brit, who claimed the victory around the streets of the Principality on his way to the World title in 2009, is relishing the challenge that awaits not only on Sunday but also during Saturday's qualifying.
"Monaco is unlike any other racetrack in Formula One.
"A qualifying lap around there is an exhilarating experience for a driver: you turn into corners on the limit and you kiss every barrier at the exit
"To get pole position, as I did in 2009, is hugely satisfying and you need to be inch-perfect for 78 laps in order to win the race.
"It's a great challenge."