McLaren's Formula 1 driver Lewis Hamilton doesn't believe their new car has currently got what it takes to match previous years' successes.

After Wednesday's test sessions this week in Barcelona, Hamilton said he could see how much progress McLaren still has to make.

Hamilton recorded the fourth fastest time of the session with 1min 22.888sec, while world champion Sebastian Vettel was  fastest in the Red Bull in 1:21.865.

Hamilton conceded they must continue to push for improvements in the car's development.