Wildcats lose prolific winger
The Ireland World Cup winger has scored 31 tries in 47 Super League games since joining the West Yorkshire club from Castleford in 2008.
However, Sydney-born Blanch, 27, has now opted to move to France as part of incoming Dragons coach Trent Robinson's rebuilding plans at Perpignan.
Advertisement
Hide AdAdvertisement
Hide AdGeneral manager Christophe Levy said: "Damien is a really good finisher and will definitely bring a lot of pace to the team.
"Dimitri Pelo and Steven Bell left the club, Chris Walker has an uncertain future with us, so it was important to strengthen our backline."