The track was posted by the 'La La La' hitmaker on online streaming service Soundcloud and it was believed to be the 22-year-old singer's first solo track since he left One Direction last Wednesday (25.03.15).
However it has now been revealed the single 'I Won't Mind' was recorded when he was in the band and was a rejected track from the group's latest album 'Four'.
A source said: ''It's important fans know this isn't a solo Zayn song or even representative of material he might record in the future.
''If you listen to the track it is clearly a song written with One Direction in mind for their last album. It's not new, nor is it a Zayn Malik solo track.''
Just a day after revealing he had departed the chart-topping band to lead a ''normal'' life, Zayn was spotted heading to the recording studio with the 30-year-old music producer, sparking rumours he was already working on his own material.
Naughty Boy - whose real name is Shahid Khan - posted the track online along with the caption: ''let the music do the talking guys. thank us later. :) x (sic)''.
However, a representative for Naughty Boy has since confirmed to MailOnline: ''Naughty Boy and Zayn wrote and demoed it as a contender for 1D's album last year.''