Team Racing Director Eric Boullier insists McLaren are "working flat-out" to recover from their 2014 slump.
After claiming a double podium finish in the season opener in Australia, McLaren have struggled for pace so far this year, and the Spanish Grand Prix earlier this month was the third consecutive race where McLaren failed to score any points.
Boullier, though, remains confident of an up-turn in form, saying the team is determined to continue improving throughout the year.
"The last three race weekends have been difficult for us, but the entire team is working flat-out to improve things," Boullier told crash.net.
"Although our drivers are coming at it from different angles - Jenson [Button] is a past winner, Kevin [Magnussen] is making his Monaco debut - both are keen to see what they can do this weekend. Monaco is always a bit of a one-off, a racetrack on which you can sometimes achieve more than you can on more conventional circuits. As in its famous casino, you can sometimes collect if you play your luck.
"Of course, we'll be relying on a little more than luck this weekend! One of the keys to getting a result at Monaco is the good work that goes on in the garage and the engineering truck. Regardless of our track performance, our mechanics have never tired in their bid to ensure our cars are well built, reliable and looking immaculate. Equally, our engineers and strategists have worked relentlessly to make sure that every ounce of performance makes it to the track."
Despite their apparent lack of pace, Boullier dismissed suggestions that McLaren have plans to abandon development of the 2014 car in favour of the 2015 Honda-powered package.
"Monaco has its own unique demands in terms of car performance, too. Obviously, we'll be bringing a track-specific package to this race - and to Canada too - but, at the moment, we're not targeting any particular race as the start of an overall turnaround," he added.
"We're simply working hard to deliver iterative improvements to the car - we're confident in that process, and hope it will start to reap dividends in the future."