It was earlier reported that De Villiers was close to inking a record deal with one of the teams.
The rule of only 2 foreign players in the playing XI will be intact despite roping in 6 overseas players which was 4 previously.
He was recently blessed with a baby and is currently playing in the IPL.
AB is currently playing the IPL for the Bangalore based franchise.
The all-rounder, who scored over 10,000 runs and took 291 wickets for Australia across formats, will continue to be available for overseas tournaments.
The South African superstar has shown interest in wielding the willow Down Under in the 2019-20 season.
Recently, the official Twitter account of the Big Bash League shared a video of a compilation of the best yorkers bowled by Matt Kelly.
These players have performed consistently in these tournaments over the years.
The Australian hard-hitting batsman was over-excited with his return to the RR and that was evident when he made a slip of tongue.
He was associated with the team since 2015.