Formula One will not race in Mexico or add a second US race in New Jersey in 2014, says Formula One boss Bernie Ecclestone.

Ecclestone said he still hopes both races will eventually be run, but neither will happen before 2015. Both races had been on Formula One's 2014 provisional calendar, but Ecclestone said both sites are having problems that won't enable them to run next year.

"At the moment, we more or less have an agreement with Mexico," Ecclestone told the press. "They have to provide the circuit. It's causing a bit of a problem. It needs to be rebuilt, their circuit."

Mexico hasn't hosted a Grand Prix since 1992. Officials knew the existing track at the Autodromo Hermanos Rodriguez at Mexico City needed major upgrades, but gave the race a tentative time slot for next November. That would have put it back-to-back with the US Grand Prix near the end of the season.

The proposed Grand Prix of America in New Jersey had been put in a May-June time slot close the Canadian Grand Prix in Montreal. But Ecclestone said there were still major obstacles to work out for that race.

Ecclestone said he remains "100 percent committed" to getting a race in Mexico and a second race in the US.