The one-off 'Friends' reunion could reportedly be turned into a 12-part series.

Jennifer Aniston

Jennifer Aniston

The cast of the iconic sitcom - which starred Jennifer Aniston, Courteney Cox, Lisa Kudrow, Matt LeBlanc, Matthew Perry and David Schwimmer - recently committed to an unscripted 'Friends' special, but an insider has now claimed that TV executives are eyeing up a 12-part series in 2021.

The source told The Sun on Sunday newspaper: "This reunion has been 18 months in the making. Cast and crew have been made to sign rigid non-disclosure agreements to keep everything as fresh and exciting as possible.

"It took a long time to convince Matthew and Jennifer in particular to get on board. But once these two were signed up, things moved pretty quickly."

The proposed 12-part series could be worth as much as $1 billion.

The insider added: "Officially, the deal has been signed for a one-off. But the hope is that once everyone sees how well it's received and how much love there is for the show, another series will be agreed and commissioned.

"If this happens, agents will be licking their lips. This will be the kind of small-screen payday the likes of which has never been seen. Including streaming rights, cast fees, spin-offs and merchandising, this could be TV's inaugural billion-pound contract."

The 'Friends' reunion was recently confirmed by the star-studded cast via social media.

They all shared a picture of the themselves together, and posted the same caption, which simply stated "it's happening" and tagged their co-stars, and HBO Max.

The sitcom - which first aired from 1994 until 2004, lasting ten seasons - was one of the most popular TV shows of all time, winning numerous awards during its original run.