An offer Andrew Walker couldn't refuse led him to abandon the ACT Brumbies and join Manly in the National Rugby League.

A dual international, Walker joined the Brumbies for the 2000 Super 12 season and broke into the Wallabies squad later that year.

It followed stints with league clubs St George and the Sydney Roosters and a one-off Test appearance for the Kangaroos on the 1996 tour of Papua New Guinea.

But Manly offered him twice the money the Brumbies had on the table for the next Super 12 season.

Walker signed a two-year deal worth $200,000 per season, while the ACT tabled half that amount per year, provided he played all scheduled matches.

"We made Andrew what we considered to be a fair offer, but the gap between the two was enormous," ACT Rugby Union chief executive Rob Clarke told AAP.

"Realistically it was an offer he couldn't refuse.

"Andrew and his family leave us with our best wishes and the considerable affection of the Brumbies and our supporters.

"He's made a significant contribution to ACT rugby and will always remain an important part of this place.

"We wish Andrew every success in his future career."

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