Thailand is expected to follow the lead of the Singapore Grand Prix by holding a night race on a street circuit.
Ecclestone was quoted as saying that the Thais were keen to hold their race at an earlier date in 2014.
“They say 2014 and I say 2015,” said Ecclestone. “It is serious and it is good.”
The 2014 calendar is already slated to include a new race in Russia and a second Grand Prix in the US.
Earlier, Thai officials said Ecclestone had agreed in principle for the kingdom to host a race in 2014 with Ratchadamnoen Avenue a likely venue.
Two years ago, Red Bull driver Mark Webber’s demonstration run at Ratchadamnoen Avenue attracted a crowd of over 100,000.
Thailand hosted the Race of Champions, which featured Formula One champions Sebastian Vettel and Michael Schumacher at Rajamangala National Stadium at the weekend.