Singers Justin Bieber and Zayn Malik are reportedly planning to collaborate for a new single.

The rumours of them working together started coming up after Bieber retweeted a link of Malik's new single from his upcoming album featuring rapper PARTYNEXTDOOR.

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"Justin has been really complimentary of Zayn's new music and there have been tentative discussions about them working on something together," a source told The Sun newspaper.

The source said that the two are becoming friends.

"They are in touch and chatting about all sorts and getting on like a house on fire. Justin even re-tweeted a link to Zayn's single on his Twitter which he doesn't just do for anyone," the source said. 

"It would be a huge collaboration if it happened so watch this space," the source added.