Felipe Massa admits he is open to a future in Formula E or the World Endurance Championship once his Formula One career draws to a close.

Massa is the fourth most experienced driver on the current grid - behind Jenson Button, Fernando Alonso and Kimi Raikkonen - with 221 race starts and 11 wins in 13 seasons. He has an option to extend his Williams deal into 2016 but, at 34 years old, he is already considering what lies beyond F1.

"Maybe," Massa said when asked about a future in Formula E. "I have so many things to think about for the moment, maybe after I will have some options in Formula E or WEC, which I think is a very nice championship and has the best car after F1, so maybe I am more interested to do that first. I don't know, maybe when I decide to stop I will have more time to think about it."

Nelson Piquet Jr won the inaugural Formula E championship, while Bruno Senna also competed in the opening season. Massa says he has spoken to his fellow compatriots about the series.

"Yeah, I talk with them and they are happy with the championship. I think also when you not in Formula One it can be a different option. I don't think they are on the same level. Formula One is Formula One and after there can be an opportunity."

Asked about whether he would be at Williams in 2016, Massa replied: "Maybe. I don't see the point not to stay here. I really like to work with this team and the team respects me a lot. I feel relaxed, we've had some good results, so I don't see why things should change. We have an option for next year, but I don't see why we would not take the option to carry on."