Troubled by an achilles tendinitis injury that he picked up at the Downer NRL Auckland Nines, Marshall trained strongly at Brisbane's captain's run on Thursday morning but has not been able to force his way into Brisbane's best 17.
Alex Glenn has one more appointment with the doctor before he is cleared from the concussion he suffered against the Sharks last week but Broncos officials are very confident that he will be passed fit to meet the Cowboys.
Providing Redcliffe coach Adam Mogg is happy to bring him into his squad that had a convincing Round 1 over Burleigh, Marshall will fly to Rockhampton on Friday and meet up with his Dolphins teammates prior to their clash with the Central Queensland Capras on Saturday evening.
Browne Park hosted a World Cup game between Tonga and Scotland in 2008 but never has it hosted a player with the drawing power of Marshall.
The Capras went down narrowly to the PNG Hunters in Round 1 in front of a crowd of less than 2,000 but with local media already in a frenzy regarding Marshall's potential arrival the capacity of 8,000 could well get a nudge.
Broncos coach Wayne Bennett was typically blunt about Marshall's inability to force his way into the team this week but has no doubt the chance will present itself as the season progresses.
"He'll play this weekend, but he won't play NRL," Bennett confirmed.
"He just can't make the squad at the moment.
"Benji just wants to be at a good club and get an opportunity and those things will happen. He's at a good club and he's more than happy to play where he has to play.
"I just want him to go back and play some football."
How he fits into Redcliffe's team is now Mogg's problem to solve with Zach Strasser and Christian Hazard starting well as the new Dolphins halves and plenty of talent in the centres in the form of Thompson Teteh and Aaron Whitchurch.