Zayn Malik solo career
Zayn Malik's first solo single is expected to feature on Naughty Boy's next albumAndrew Burton/Reuters

The former One Direction star Zayn Malik has filed for the new "Zaughty" trademark, which includes uses for fashion and music.

Zayn Malik and his friend and producer Shahid Khan – known as 'Naughty Boy' – are reportedly planning a release of their own clothing line and potential music ventures.

A source told The Sun that the pair have been approached to design and work with several brands, but have always declined the flooding offers because the want to do it their way.

They plan to launch a line of streetwear, but may pair it with a music project in future.

Zayn Malik left One Direction in March 2015 after being signed off with stress, while the band was on tour in Thailand, in order to pursue a "normal 22-year-old life", but he was seen recording in a studio with Naughty Boy days later.

Meanwhile, One Direction fans are still hopeful for Malik's return to the band, taking to Twitter on Friday 3 June a with thousands of tweets letting him know he's on their minds, using hashtag #100DaysSinceZaynLeft.

The pair met at the Brit awards, and connected over their Pakistani family heritage.

Naughty Boy spoke to BBC Newsbeat about their relationship on 3 July: "I was there for my friend and in this business it is not the easiest thing to make genuine friends. During that time we weren't making music, we have made music in the past. The world will hear the music but when he is ready and when the fans are ready."

"This year I want to get back to business as usual and when Zayn's ready, probably next year for his music, I'm there for him," said Naughty Boy.

Naughty Boy tweeted Zayn's first solo track entitled I Won't Mind on Soundcloud, which drew over a million hits, but was taken down after an angry response from One Direction's Louis Tomlinson.

Naughty Boy, whose real name is Shahid Khan, has previously worked with Emeli Sande, Tinie Tempah, Ed Sheeran, Leona Lewis and Rihanna, with other artists including Rita Ora and Kanye West wanting future collaborations with the producer.