Two-time Formula One champion Fernando Alonso on Friday described his Ferrari team's new F10 car as the best of his racing career.

"It's the best car that I've ever driven," the Spanish driver said after testing in Barcelona.

"I'm not saying that I have the best car on the grid, but it's the best that I have ever had. However, I don't know if that will be enough."

Changes from last year's car, the F60, include a larger fuel tank and a reshaped, more slender nose.

Alonso said Ferrari, McLaren, Mercedes and Red Bull would all be strong contenders to take this year's constructors crown, but added that "Renault or Sauber could also start the season strongly".

The 28-year-old made his name with Renault, where he beat Michael Schumacher to the Formula One title in 2005 and 2006.