Adele has five "really great" songs leftover from writing her latest record '25'.

Adele

Adele

The 'Hello' hitmaker spent 2014 locked in the studio penning tracks for the long-awaited album and teased fans for months about its release date, but has now revealed she has a plethora of hits that didn't make the LP because they would have been more appropriate to feature on a future record.

The star shared: "There are definitely four or five other songs that I would definitely revisit. We didn't finish it in time and also it just felt like maybe I should be like, 32, when I do it rather than 27?"

And there's one remaining song that could be a "hit" which she wrote with 'Hello' co-writer Greg Kurstin.

She mused: "It's really, really great actually."

Speaking about her songs from her '21' writing session, she's also confident there's a few gems hidden away in her back catalogue there too.

She told Rolling Stone magazine: "I'm sure they'll see the light of day."

Meanwhile, the multi-million selling artist - who has three-year-old son Angelo with her partner Simon Konecki - is at least sure of one thing, that she's in the music business for the long haul.

She said: "I will be making records for the rest of my life, I think."