Force India team principal Vijay Mallya warns it will be "naive bordering on stupid" to think that McLaren won't improve in the latter half of the season.
The Silverstone squad impressed during the first half of 2013 as Paul di Resta and Adrian Sutil scored 59 points in the opening nine races to put the team ahead of McLaren.
However, they finished on a low in Hungary as both drivers were forced to retire while Jenson Button and Sergio Perez picked up eight points to reduce the deficit in the standings to just two.
Mallya, though, says McLaren were always going to up their performance at some stage following their poor start to the season.
"At Silverstone we were 22 points ahead of McLaren and everyone came and asked me the same question [about whether we could stay ahead]," he told ESPN.
"I said, look, I'm not a fool. McLaren is a multiple World Championship team, they have humongous resources and it would be naive bordering on stupid to think that McLaren won't pick up their performance.
"I think at the last race, a one-race win would have wiped out the entire deficit. They are capable of winning races whereas Sahara Force India are still stepping up the ladder. I'm not surprised they have closed the gap, but we are still in front.
"We will do our best to continue our good form in the second half of the season and at the end of the day it is Brazil that will matter and it's just one point in the Championship that could also matter - as we learned three years ago as Williams got ahead of us with one point."
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