Arriving on transfer deadline day, Sylla becomes the first new arrival of the January transfer window for Villa, who are currently 19th in the Barclays Premier League.
The defensive-minded player passed a medical on Thursday morning and is eligible to make his debut in Saturday's league clash with Everton at Goodison Park.
Sylla, who has represented France at Under-21 level, said: "I'm very excited about the prospect of playing for Aston Villa and also to be playing in the Premier League."
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