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.''
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