The 23-year-old speedster scored four tries in six NRL games for the Bulldogs and has represented Fiji on three occasions.
Walker, 21, is the son of former NRL prop Shane Walker and joins Panthers from Cronulla Sharks.
21-year-old playmaker O’Donnell won an SG Ball premiership with Sydney Roosters in 2014.
He played 32 games for the South Sydney NYC side in 2015 and 2016 and reunites at Panthers with his former halves partner Liam Coleman.
Capable at both five-eighth and lock, Keighran progressed through the junior grades at the Bulldogs and represented the Australian Schoolboys in 2015.
Last season the 20-year-old scored nine tries in 19 games for the Bulldogs NYC side and also made three appearances in the Intrust Super Premiership NSW.
Peato joins Panthers after an impressive season on the wing as Campbelltown City Kangaroos won their first Group Six premiership in 34 years.
Phillips, O’Donnell, Keighran and Peato have already commenced pre-season training with the Panthers squad while Walker is enjoying a short break following his recent World Cup commitments.
Penrith Panthers 2018 Player Movements
|2018 Gains: Adam Keighran (Canterbury-Bankstown Bulldogs, 2018), Chad O'Donnell (2018), Joey Peato (2018), Tyrone Phillips (Canterbury-Bankstown Bulldogs, 2018), Jayden Walker (Cronulla Sharks, 2018)|
|2018 Losses: Sitaleki Akauola (Warrington Wolves), Zach Dockar-Clay (Hull Kingston Rovers), Peta Hiku (New Zealand Warriors), Samisoni Langi (Catalan Dragons), Te Maire Martin (North Queensland Cowboys), Matt Moylan (Cronulla Sharks), Darren Nicholls (St George Illawarra Dragons), Michael Oldfield (Canberra Raiders), Mitch Rein (Gold Coast Titans), Malakai Watene-Zelezniak (Wests Tigers)|
|Re-Signed: Wayde Egan (2019), Corey Harawira-Naera (2020), Sione Katoa (2019), Viliame Kikau (2018), Dallin Watene-Zelezniak (2020), Dean Whare (2022)|
|Off Contract 2018: Oliver Clark, Adam Keighran, Viliame Kikau, Soni Luke, Josh Mansour, Chad O'Donnell, Joey Peato, Tyrone Phillips, Jayden Walker, Peter Wallace|