Paul has worked with 1D since 2010, however he has allegedly parted ways with the band, after falling out with Zayn.
The row is thought to have begun when Zayn failed to join his bandmates in the US to promote their latest album ‘Four’.
The paper reports that Paul flew home early, ahead of Zayn’s late arrival in the States.
“He’s always been at the heart of the One Direction team, and it’s hard to think of them going on tour without him there.”
Zayn and Paul in 2012
Before Zayn arrived, the band completed a number of engagements as a four-piece, and they faced an incredibly awkward moment when one presenter asked if Zayn had a “substance abuse” issue, which the lads categorically denied.
Despite the alleged disagreements behind-the-scenes, ‘Four’ has been a huge success, shooting straight to the top of the UK Album Chart on Sunday.
The band also scooped three gongs at the American Music Awards.