The 28-year-old only returned to training two weeks ago and is therefore not expecting to light up the timesheets on Saturday.
Stanning told BBC Sport: "I've not been training long enough so I'm not expecting to do particularly well.
"But it's just important for me to get on and do it and accept where I am. Then I've got something to build from.
Managing army life & Olympic ambitions
"The goal is to be selected for the World Championships next year. Which boat that is, the selectors will have to decide. I just need to make sure I'm fit enough to get in the squad."
Glover wouldn't be drawn on talk of seat selection. "Until a few months into next year, we won't have any idea what boats we're in," she told BBC Sport. "Everything resets to zero and everyone has a chance."
In the men's event, Olympic and world champions Alex Gregory, Andy Triggs Hodge and Pete Reed will compete in pairs.
Gregory teams up with former world under 23 champion Mat Tarrant, Triggs Hodge lines up alongside Oliver Cook, while Reed partners James Foad.
Olympic bronze medallist Constantine Louloudis, who triumphed in the November winter assessment, partners Karl Hudspith in the pair while Alan Campbell, who won bronze in London, goes in the single.
In total, 148 boats will be in action on Saturday. Winter training continues through the festive period, though rowers will be released to spend Christmas with their families.
In the new year, the selectors will start to formulate crew partnerships with the final decision made after the senior team trials at the team's training base in Caversham in April.
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