The trio told Digital Spy that they haven't yet completed their first record Swings and Roundabouts, but hope to have it out before the end of the year.
Asked backstage at T4 On The Beach when fans can expect to hear more music, Karis Anderson said: "About September. We're just getting it ready and we haven't picked the final final [tracklist].
"We keep adding new songs and being like,'Yeah, we want that one on there!' It's hard, but October/September [it should be released]."
Talking about their third single, Alexandra Buggs teased: "It's between an uptempo and a ballad and a kind of Motown-y pop track."
Stooshe recently reached number four on the UK singles chart with their latest track 'Black Heart'.
Watch the music video for Stooshe's 'Black Heart' below: