Ariana Grande has sent speculation soaring about a possible collaboration with Nathan Sykes.

The two singers were in a relationship for a number of months before their split was revealed in early 2014.

The former Wanted man recently tweeted that he has worked with a secret star on a new version of his single 'Over And Over Again'.

Grande hinted on Twitter on Sunday (January 10) that she could be the new feature on the track.

She wrote: "From the heat of night to the break of day I'll keep you safe & hold you forever.." #OverAndOverAgain."

Sykes is due to release his debut solo album in 2016.

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Watch the video for 'Over And Over Again' below: