McLaren are considering a 'radical' approach to its 2014 Formula One car if they don't show a marked improvement by the time the British Grand Prix starts in the beginning of July.
After starting the season with a double podium finish, the Woking team has struggled for pace since the season-opener in Australia and Jenson Button and Kevin Magnussen have failed to score any points in the last three races.
While McLaren are hopeful that the downforce improvements that have already been produced by the factory will supplement the MP4-29, Racing Director Eric Boullier believes the British GP will be something of a watershed race for them.
"We have put everything in place," Boullier told the media during a McLaren phone-in on Tuesday.
"It is true that we are starting from quite far back to be honest, but we have a very good rate in terms of development.
"Monaco and Canada are a bit special in terms of their track layout, so the question of how capable we are of catching up, and how fast we are catching up, will be for Austria and Silverstone.
"I am not saying we will be win Silverstone, but we will know more about our capability to catch up in these races.
"I don't think we will shift our focus onto 2015," he added when asked by Autosport if they are considering halting development of the 2014 car.
"But it's possible that we will draw a line after Silverstone and we may go with more radical concepts."
While the switch to Honda power units next season have already been confirmed, McLaren remain without a title sponsor and are amidst their worst run of form since 2009, when they failed to score any points in four successive races.
Nevertheless, Boullier remains confident that they will be more competitive in Monaco next week.
"We have seen very, very significant progress in the wind tunnel in the last few weeks, so I think we need to just understand where we are, where we want to go," the former Lotus boss added.
"Monaco could be not bad for us. Our car is well-balanced in low-speed corners and very driveable, so Monaco could hurt us less."