McLaren's 2018 car arriving in Barcelona

McLaren’s racing director Eric Boullier says the team’s real 2018 car won’t be seen until next month’s Spanish Grand Prix.

McLaren had issues with reliability during pre-season testing, which forced the team to alter its upgrade schedule.

Boullier described the current car used this season as an evolution of last year’s Honda-powered design.

"The 2018 car is coming to Barcelona, and obviously we hope that's the car we expect it to be,” Boullier said.

"The car we have now, is as per plan, it's not that we missed the targets with it.

The Renault powered MCL33 has proved strong in races, but has lacked qualifying pace, and Boullier has admitted the opening races have been frustrating, saying:

With the lack of qualifying speed, a McLaren have yet to make it to Q3 in 2018, but has scored points in all three races, leaving the team fourth in the constructors’ championship.