The British producer - real name Dan Stein - revealed that he has been in the recording studio with the five-piece, but didn't indicate whether the tracks are for their comeback album or his own solo project.
"I've been working with Girls Aloud recently," Stein told the Daily Star. "I can't really talk much about it yet because it's early days but I can say we've been in the studio together."
DJ Fresh is working on material for Girls Aloud with his new production team The Committee, which features former Orson members Jason Pebworth and George Astasio, as well as Xenomania's Jon Shave.
"They often turn to me and say, 'Dirty it up and make it crazy'," DJ Fresh joked. "That's my input - writing dirty hooks that stick in people's heads."
Meanwhile, DJ Fresh will release his new album Nextlevelism on October 1.
The star told Digital Spy earlier this year that the collection will feature collaborations with Rizzle Kicks, Juliette Lewis and The Fray.
Watch the music video for Girls Aloud's 'The Show' below: