The Daily Mail report that a young player at the club was punched by the Portuguese.
Nani has been poor this season, in contrast to his rivals for a place in the team like Ashley Young and Antonio Valencia.
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The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.
Five English clubs will compete in the last sixteen of the Champions League for the first time ever as Liverpool, Manchester United, Manchester City, Chelsea and Tottenham face some difficult away matches.