Charlie Puth and Lionel Richie are being eyed for 'American Idol'.

Charlie Puth

Charlie Puth

The ABC revival of the long-running Fox talent competition - which came to an end on the network in 2016 - might be close to rounding out its judging panel, as sources have reportedly confirmed to Variety magazine that 'We Don't Talk Anymore' singer Charlie and 68-year-old musical icon Lionel are in "advanced talks" to join the show.

If the pair do come on board, they will be joining Katy Perry as the only confirmed judge so far.

According to Variety, show bosses are reportedly also eyeing country singers Luke Bryan and Keith Urban, and are considering expanding the panel - which has traditionally been comprised of three judges - to house an extra judge.

Meanwhile, Ryan Seacrest - who hosted the show during its run on Fox from 2002 to 2016 - was confirmed to be returning to the re-boot in his hosting position when the show makes its eagerly-anticipated comeback next year.

In a statement, ABC Entertainment president Channing Dungey explained: "So much of 'American Idol's overwhelming success can be attributed to Ryan, whose larger-than-life personality and laudable dedication to creating quality entertainment has made him a true master of his craft. His talent is limitless, and I can't think of a more appropriate person to honour the Idol legacy as it takes on new life than the man who has been there through it all."

And 'Bon Appetit' hitmaker Katy said she was "honoured and thrilled" to be a part of the show when news of her casting was announced in May.

She said: "I am honoured and thrilled to be the first judge bringing back the 'American Idol' tradition of making dreams come true for incredible talents with authentic personalities and real stories. I'm always listening to new music, and love discovering diamonds in the rough - from mentoring young artists on my label, or highlighting new artists on my tours, I want to bring it back to the music."