Romain Grosjean has said he has no reason to doubt Lotus' competitiveness this year

Ahead of Formula 1's crunch pre-season test in Barcelona later this week, Romain Grosjean has said he has no reason to doubt Lotus's competitiveness.

Teams could struggle to complete their programmes once again if this week's weather forecast is anything to go by. Rain is forecast on at least two of the four days, with temperatures again struggling to climb above 15 degrees Celsius. "It's the same for all 11 teams. It's not easy, that's for sure. We would love to have it sunny and a track temperature of 25 degrees, what we're going to get all season long," Grosjean said. "But winter testing is winter testing. We know it can be cold. It was less cold last year - I think then we were lucky with the weather." Lotus will bring updates to both Barcelona and Melbourne. Of this week's test, Grosjean said: "It's the last one, you can change big set-up items you couldn't change in the first two, especially with the weather. We'll see how it is. If there are one or two big set-up items we can check and make sure if we want - or don't want - to use them in the season then that would be great. "And then one day, working more or less as we would on a race weekend, trying to make some small set-up changes to make it more comfortable and then it'll be quicker."