The young forward, who almost 13,000 DT coaches already own and many more are sizing up, was a late withdrawal for Freo's last match against Port and faces a fitness test for this weekend's Geelong game.
Ballentyne, Freo's number 21 selection at the 2008 AFL Draft, has a back problem but is definitely in the mix for a game.
"We think he's up for playing AFL, but we'll be guided by our fitness and strength guys," Harvey said.
"He's had a spasm and it's taken a bit longer [than expected to recover]. It's a fine line all of this. You don't want to be breaking him down at this stage."
Harvey did reveal key defensive duo Antoni Grover ($239k) and Luke McPharlin ($252k) would return this weekend against the Cats after injuries, while Des Headland (a $263k forward) would face a fitness test after a quad problem.
Young tall forward Adam Campbell ($226k), who was concussed early against Port last round, has recovered from concussion also and will be available for the Geelong game.
The Dockers coach also acknowledged $282k defender Michael Johnson (ankle) and $251k forward Chris Mayne (stress fractures) were at least a fortnight away.