The Gunners signed the midfielder as a 16-year-old from the Catalans, with the Spaniard - now 21 - going on to become Arsenal's captain and a Euro 2008 winner with his country.
However, Wenger has responded to Rummenigge's blast with an example of his own, countering that Bayern signed Roque Santa Cruz - currently with Blackburn - from South American side Olimpia Asuncion when he was just 17.
"It is an old speech," said Wenger. "Look at Santa Cruz at Blackburn. Ask him what age he came to Bayern Munich.
"Then you have an answer for Karl-Heinz Rummenigge."
NEWS: Rummenigge: Wenger is like a child-trafficker
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