Vincent Kompany suffered a losing start to his career as player-manager with Anderlecht on Sunday as Ostend pulled off a 2-1 win in the Belgian league.
Kompany, the former Manchester City skipper, returned to his formative club in the summer after helping the English giants to another Premier League title.
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It was also a losing debut for former French international Samir Nasri who came on as a 60th-minute substitute for Anderlecht.
Anderlecht, who have been Belgian champions on 34 occasions, finished last season in sixth place.