Signing for two years, the deal will see the prop forward in the black, white and blue for the 2018 and 2019 season.
Sharks Head Coach Shane Flanagan said he is excited to have Ava sign and believes he will continue to develop whilst at the Club.
“He (Ava) is a quality NRL front rower who we have been monitoring for two years,” said Flanagan.
“We are very excited to add such a player to our 2018 squad and believe we can progress his game to another level.”
Having made 96 appearances for the Wests Tigers over five season and will add size and strength to the Sharks midfield.
This was first published on the Cronulla Sharks website