Harry Styles is working on new songs that will "blow the socks off the world", according to Snow Patrol's Johnny McDaid.
McDaid said he had been collaborating with the former One Direction singer "for years" - but recent songwriting sessions have been particularly exciting, he added.
"I've been friends with Harry for a long time, and we've written together a lot," he said.
"Harry is a really prolific artist and a super-talented guy.
"He's really authentic and he has an incredible voice, so we've been writing a lot of songs. We've been writing songs for years together."
One Direction are currently on hiatus, leaving band members - including Styles (22) - free to pursue solo projects.
McDaid (39), who is the keyboardist and guitarist for the Northern Ireland indie rockers, said he was unsure when fans could expect to hear any of Styles' new material.
"I don't know about soon, I don't know how long that is," he said. "But I would imagine that Harry would come up with something that's going to be pretty special, and from what I've heard, it'll blow the socks off the world."
The two take an informal approach to songwriting, preferring to steer clear of the studio when they work together.
"I've never been in a studio with Harry, we tend to just hang out at his house or mine," said McDaid.
"It's just the way he likes to do it and the way I like to do it, so it means that we can order takeaway and kick up ideas."