Zelic, who spent three seasons with Dortmund as a player, has now outlined the problem Wenger will have to deal with once the 28-year-old seals his switch to north London.
"That’s a tough question," Zelic told Fox Sports, when asked about how Arsenal will set up tactically with Aubameyang.
"I definitely would play that system where I’ve got [Henrikh] Mkhitayran in that wide area.
"I’d go full on Aubameyang up front in place of [Alexandre] Lacazette. Sure, there’s a possibility of using both, but it’s a tough one because you’re experimenting mid-season.
"I don’t think Wenger knows himself what his best formation is, so for me to provide the magic now [laughs]! That shows how their season has gone."
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Borussia Dortmund star Pierre-Emerick Aubameyang is poised to move to Premier League side Arsenal
How to pronounce Pierre-Emerick Aubameyang
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Pierre-Emerick Aubameyang arrived in London yesterday to complete his big-money move to Arsenal
Zelic admitted there are a number of ways Wenger could use Aubameyang and Lacazette as he tinkers with his team though.
"The possibilities are endless… there is flexibility there, and Aubameyang started out as a wide player, who after a disastrous loss to Augsburg a few years back, was just thrown up front and exploded," he added.
"He knows how to play in those wide areas. It’s realistic to have Aubameyang on the wing… but the fact he’s such a tremendous goal scorer, you feel he could be wasted there.
"I feel he’s best suited up front. So is it deep lying, in a central role making runs in behind Lacazette? That’s an option as well."