The Kiwis league international is the club's 'Mr Fix-it' against Souths.
Brisbane is looking for his replacement with an NRL season left on his contract.
The Sharks veteran thinks Walker got what he was asking for from Curtis Scott.
Brisbane have reportedly tabled a huge offer to poach the mastercoach from Melbourne.
The skipper was a late scratching last week, but is set to return against Souths.
The NZ Kiwis second-rower narrowly avoided an extra week with his poor disciplinary record.
The Dragons maintain their spot atop the NRL ladder after beating the Raiders.
An injury-hit South Sydney face the NZ Warriors in their next match.
The Titans have ended their five-match losing streak with victory over Newcastle.
Curtis Scott has become the first player since 2015 to be sent-off in an NRL match.
Competition for spots in the Warriors side heats up after the utility's NRL comeback.
The Warriors bounced back from last week's loss to claim a scrappy victory over Parramatta.
Wing Jamayne Isaako clinched a late NRL win over the Roosters.
The Warriors have won three of the last five NRL fixtures against the Eels.