Momirovski will join the club in time for the 2019 season, meaning his deal will run through until the end of the 2020 campaign.
The 22-year-old has played one first grade game for the Roosters, and scored a try in his only appearance back in Sydney’s 20-12 win over the Titans in Round 18.
Tigers coach Ivan Cleary spoke to the club’s website about Momirovski, and said he was pleased to add the young centre to the club’s list.
“Paul is an exciting young player with a bright future ahead of him,” Cleary told weststigers.com.au.
“We look forward to seeing him take his own game to the next level in the coming two seasons and help grow the strong future we have here at Wests Tigers.”