Hughes will make Wollscheid a permanent signing for £2.75m, according to reports in Germany.
Bayer Leverkusen assistant sports director Jonas Boldt told Express: "We will wait and see but it looks as though Stoke will take up the option (to sign him permanently)."
Wollscheid joined Leverkusen for £5m in 2012 and played 51 times in the league and four times in the Champions League before slipping down the pecking order.
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