The London trio previously suggested that they would reform in 2013 after releasing their respective solo efforts later this year, but Fazer has insisted that a reunion will not be able to happen until 2014.
"I couldn't reform the band now. I've signed an international deal that involves me going to Australia at the end of next year when the new album's out, then New Zealand, Japan, America," he is quoted by the Daily Star as saying.
"Hopefully at the end of 2014 I'd like to speak about reforming the band."
Meanwhile, the rapper and producer recently revealed that he has helped Tulisa Contostavlos with her new single 'Freedom'.
Watch the music video for N-Dubz's 'I Need You' below: