The rapper - real name Richard Rawson - tweeted a photo of the pair together, saying that they had completed a new track in the studio.
"Jus left the studio wiv @TheDappy now back 2my lab 2finish a certain record! Coz were finalising it on Tuesday! (sic)," he wrote.
He later added: "Ive got some good news coming nxt week!! Watch this space!!! #STLMUSIC #excitingtimes patience is a virtue!!!"
Tulisa Contostavlos confirmed that N-Dubz had split up after 12 years together last month.
Fazer recently revealed that he wants to work with The Voice UK coach Danny O'Donoghue.
Dappy has stated that he has felt "lonely" without his former bandmates Fazer and Contostavlos.
> Dappy announces UK headline tour
Watch the video for N-Dubz and Tinchy Stryder's 'Number 1' below: