Kodaline spoke of writing with Styles earlier this year and revealed they co-wrote a song about unrequited love.
Speaking to Digital Spy, however, singer Steve Garrigan said it was one of hundreds of songs.
"There are hundreds of songs flying around," he said.
"It could be on his album, if he does something. But I don't know. Nothing is set in stone."
The band weren't formally assigned to writing with Styles - he simply turned up at a show and said he liked their music.
"We had a bit of free time and so we went to the studio, and wrote a song. It was good fun," Garrigan said.
The news has sparked fears amongst One Direction fans of a split as Harry appears keen to record solo material.