Former One Direction star Zayn Malik has made his solo debut only days after quitting the band after a demo of one of his new songs appeared online.

The track, called I Won't Mind, which features the star singing over an acoustic guitar, was put up online by producer Naughty Boy, sparking an angry reaction from Zayn's former bandmate Louis Tomlinson.

The musician, who has also worked with acts including Emile Sande, told fans: "Let the music do the talking guys. Thank us later. :) x".

But Louis took to Twitter, telling him: "Wow @NaughtyBoyMusic you're so inconsiderate pal, seriously how f****** old are you ? Grow up ! #masterofallwisdom".

Louis then told fans: "Always have struggled to bite my tongue."

The boyband, which was put together after entering the X Factor as solo acts, has spoken out to quash rumours that will split up in the wake of Zayn's departure.

The band vowed to continue as a four-piece after he left saying he wanted to live like a "normal" 22 year-old.

HEAR ZAYN'S NEW SOLO TRACK FROM PRODUCER NAUGHTY BOY

His shock departure was swiftly followed by reports that the group was on the verge of breaking up, but singer Liam Payne thanked fans for sticking with the band and "not thinking it's finished".

He tweeted: "I can see a lot of people thanking us for staying but your the real Heros (sic) here thanks for not thinking it's finished."

The band has continued its tour and have been playing concerts in South Africa.

Bradford-born Zayn quit the group last week after jetting back to Britain having been "signed off with stress" amid reports he had cheated on his 21-year-old fiancee, Perrie Edwards.

Zayn, who grew up in East Bowling, said he was "upset" for the group's many millions of devoted fans - known as "Directioners".

And he insisted there is no bad blood between him and his former bandmates, who had been "really supportive".