United have swooped to land Bailly from Villarreal in a £30m deal that makes him Mourinho’s first signing since taking charge at Old Trafford.
The Ivorian centre back, 22, has signed a four-year-deal worth £75,000-a-week with the option of an extra two seasons.
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Mourinho reckons his first capture has the potential to go on and become one of the best in the business.