Sergio Perez has warned that McLaren could find it difficult to score good points in this season's remaining races.
Struggling for form this season, McLaren have spent this campaign trailing in the wake of Red Bull, Ferrari, Lotus and Mercedes.
And Perez reckons it will be more of the same in the final seven races as the leading teams have a reason to continue to pushing hard as they are all involved in the Championship fight.
"Obviously, the fight at the sharp end of the Championship means that the top three or four teams are still pushing hard to develop their current cars, whereas some of the others are looking more towards 2014," he explained.
"That means that it's getting slightly harder to score good points in the remaining races.
"However, we've still got developments coming through - most with an eye to next year - and I hope that we can maximise our package for one of the toughest races of the year."
The Mexican racer, though, is hoping that McLaren can pick up the pieces - and the points - should those ahead falter this weekend in Singapore.
"Singapore is an unpredictable race - it's tough on drivers and machinery, so we'll be looking to get the best from our high-downforce set-up and see if we have a car that can ride the circuit's many bumps.
"I like street circuits - you can really attack the corners! - so I'm really looking forward to the whole weekend."