Lachlan Croker was injured in his NRL debut for the Raiders.

Manly have announced the signing of talented Canberra playmaker Lachlan Croker for 2018 on a one-year deal.

Croker, the nephew of former Kangaroo Jason Croker, played NSW under-18s and under-20s and has also represented Australia at under-20s level.

The Crookwell Green Devils junior played one NRL game for the Raiders in 2016 and was a key member of the Mounties team that featured in the 2016 Intrust Super Premiership Grand Final.

Sea Eagles Regional Scout Scott Fulton said Croker offers tremendous utility value.

"Lachlan is a very good player who has come to Manly looking for an opportunity,'' Fulton said.

"He is a player with plenty of pace who can cover several positions including half, five-eighth, and hooker."