The Belgian made his playing comeback at Sunderland on Saturday.
"Thomas has gone through a difficult period but he is a great player, and will show that in the future now that he is completely fit and back available," Wenger said.
"He is naturally a left sided player, more than anybody else. I like to have a central defence where you have a right-footed player and a left-footed player. That is why I always build around Thomas."
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