In 2017, Peni returned home to Perth to play rugby, signing for the Western Force of the Super Rugby. In round two of the 2017 season Peni scored his first try for the team. A pass from Jono Lance after a line out, followed by an explosive run, which lead Peni to a quick try one minute into the game against the Reds. They finished 26–19 winners at nib Stadium, Perth.[10][11] In June 2017, Peni re-signed for the Force for another two years,[12][13] with the ARU vowing to honour player contracts despite the team being axed from the competition.[14]
Peni missed eight rounds of the 2017 season after rupturing his groin during a game against the Kings in round seven.[15] Peni played seven games during the 2017 season scoring four tries.
Brumbies
In November 2017, after a breakout first Super Rugby season Peni left the now axed Super Rugby team the Western Force and signed a one-year deal for the Brumbies for the 2018 season, in hopes of playing future rugby for the Wallabies.[16][17][18][19][20] Peni scored his first try for the Brumbies in round four of the 2018 season against the Rebels in a 33–10 defeat at AAMI Park, Melbourne.[21][22][23][24]