Toure trialled with Arsenal as a youngster.
When asked where he puts his failure to sign Toure in his list of regrets, Wenger simply responded: "At the top."
The Frenchman added: "But let's not forget Toure had an agreement with Arsenal. We waited for his passport in Belgium but he went to Ukraine [instead].
"He's not a mistake but he preferred to go to Donetsk without a passport."
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