Lotus pair Romain Grosjean and Heikki Kovalainen both admitted they hadn't been fast enough following qualifying for the Brazilian Grand Prix.

Grosjean was the better performing of the pair having made it through to the final stage of qualifying, which was delayed by heavy rain and standing water on track.

Having been the first man to switch to intermediate tyres in Q3, Grosjean briefly held provisional pole only to slip back to sixth as others improved.

"That was quite a difficult afternoon," he said. "It was tricky to decide which tyre we should use for the final qualifying session and we wanted to try for pole which is why we used the intermediates, but in the end there was probably just a little bit too much water which certainly made things interesting.

"Ultimately my lap wasn't good enough, but the car has been strong all weekend so we're confident for the race no matter what the weather is. Certainly, my Q2 lap in the wet today was very good and we know we have a strong baseline setup in the dry, so let's see what happens."

Kovalainen meanwhile was eleventh fastest having just missed out on the top ten, leaving him with work to do to score points on his second outing for the team.

Speaking afterwards, Kovalainen said he could have no complaints at failing to make it into Q3, but said he was sure of a better showing on race day.

"It's disappointing not to make the top ten, but I just didn't have enough pace in the second session; it's as simple as that," he said. "The conditions weren't ideal, but it's the same for everybody and there was nothing wrong with the car so I can't have any complaints.

"It's not the ideal starting position, but the car is performing well and anything can happen in motor racing - especially here at Interlagos - so we'll look at where we can improve for tomorrow and try to do a better job in the race."

Trackside operations director Alan Permane admitted the qualifying session had been disappointing for the Enstone-based team but backed both drivers to improve when the race gets underway.

"Rather disappointing," he said. "The car has been performing well all weekend in the wet conditions, so we were hoping for a strong performance. Heikki was unlucky to narrowly miss out on going through to the top ten by a very small margin, and conceded a couple of small errors on his lap. In the final session we let Romain down with a poorly timed pit stop after making the call to put him out on intermediates. These were the right tyres, but we should have waited a little before he started his run on them.

"We still have a good chance for a strong result tomorrow. Both drivers have been very comfortable with the car in the wet conditions today and we know it performs well in the dry. If it's dry then everyone will be heading into the race without any tyre data, which could be an advantage for us as our tyre management in the race is generally amongst the best on the grid."