Fernando Alonso will make a decision on whether to extend his F1 career beyond 2017 after sampling the new cars being introduced next year.

F1 bosses have recently agreed to significant regulatory change for 2017 aimed at increasing lap times by around three seconds with wider cars and tyres. Alonso has been a vocal critic of the current formula, recently saying F1 in its current form is too complexed for the average fan to understand.

The Spaniard's contract at McLaren runs until the end of 2017 and he has been linked with a switch to the World Endurance Championship and Le Mans 24 Hours, which he came close to competing in last year alongside his F1 commitments. Alonso says he will have to consider his future if the new generation of cars do not bring back the old excitement of racing.

"The [current] cars are too slow and the pleasure of driving them has gone," Alonso told Spanish TV channel TVE. "I still have a few years left at the top. I'll wait another two and then see how my body feels. I am quite curious to see how the 2017 F1 cars will look like. I'll try one and think about my future thereafter."

Alonso, 34, says the decision to leave F1 would not be made lightly as it is unlikely he could ever return.

"I don't know what I'll do after 30 years at the wheel, but once I take my decision there will be no turning back. Before that, I'd like to compete at the Le Mans 24 Hours and return to karting, which I have always loved."