Niall Horan would drop everything to take part in an One Direction reunion

He said: "I told my ¬managers from the start: When One Direction comes knocking, fook what I’m doing. I don’t give a s**t if I sold out arenas or won Grammys. I wouldn’t be doing this if it wasn’t for that."

However, the four of them haven't even talked about when it will be just yet.

He added: "We haven’t even had a ¬conversation about how long we think the break will be."

And there are certainly parts of band life that the 23-year-old singer misses.

He told the new issue of Billboard magazine: "Every now and then you’re like, ‘Fookin’ hell, where is everyone?'

"You’re sitting in an airport lounge, they call you for a plane, and you don’t stand up initially because you’re waiting on ¬everyone else, you know? ‘Oh, Louis’ll be back from the toilet in a minute.'"

Meanwhile, Niall previously admitted he remains confident One Direction will reunite in the future after they pursue their own solo projects.

He shared: "It's been a year and a bit already. We don't want to put a time on it. But when that phone call does come, no matter whoever it comes from, we're back again.

"At the minute it's exactly where it was six months ago - we're doing our own thing. You know I'm going to probably end up touring [with his solo music], Harry will probably end up doing the same, probably Liam probably, Louis, that's a year - time adds up."

Niall split from his mentor Simon Cowell when he embarked on his own solo career, but the star hopes he can maintain a good relationship with the music mogul.

Asked if Simon hates him now, Niall added: "I hope not, please don't hate me. I just felt like I wanted and needed a fresh start.

"It's a long time to be at a label I wanted to broaden my horizons and try something new.

"We both know that and when One Direction come back we'll still have albums left to do."