They had the opportunity to sign him for nothing in the summer, but they passed it up.
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Still, after his impressive recent displays for Aston Villa, the Spanish powerhouses are once again keeping a watch on him.
The Belgium international has played for Villa in 24 matches across all competitions, tallying five goals during that time.
The 26-year-old has recently established himself as a mainstay in Emery’s starting lineup as the team is enjoying a fantastic run of play, winning consecutive games against Man City and Arsenal.