The pair boast more than 400 first-grade games between them, strengthening the level of experience within the Club’s playing roster for the 2016 season.
Halatau has played a total of 226 NRL matches since making his debut in 2003, with 157 appearances for Wests Tigers over two separate stints.
The Merrylands and North Ryde junior spent four seasons with the Bulldogs (2010-13), before returning to Wests Tigers in 2014.
Ballin, 31, made his NRL debut for Manly-Warringah in 2007 and has played 217 first grade games over nine seasons.
The Kingaroy junior has won two premierships with the Sea Eagles (2008 and 2011), whilst also representing Queensland during the 2010 State of Origin series.
Ballin today signed a two-year contract with Wests Tigers after being granted an early release from Manly-Warringah, where he was contracted until the end of 2016.