Titans winger Walker was widely believed to be on his way to the Grattan Stadium for next season, and rejected a new contract with his current NRL club.
However, the Bulls apparently decided against the deal to sign Orford instead, which now leaves Walker without a club for 2010.
Walker’s manager Chris Orr revealed that he will be lobbying to the RFL to block Orford’s Bradford move.
He told the Australian Ten Network: “We will be looking at all options and the players association will be looking at all options and until Chris Walker‘s situation is resolved I can’t see how they can sign Matt Orford.
“It sets a terrible precedence if clubs can stockpile contracts sat on their desk and pick and choose who they want to activate.
“There has got to be a duty of care.”