Gera is now recovering from an injury knock.
"Zoltan has about 500 games behind him - he doesn't need games," Clarke told the club's website.
"The first thing for Zoltan is to get fit so he can train day in, day out.
"Eventually with the qualities he's got that will lead to selection, either in the XI or the 18, and a chance to play out on the pitch and show everyone he can play at the highest level again - and I'm sure he can do it."
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