article_snippet.sent: Booked: Ivanovic, Drogba, Oscar .
article_snippet.sent: Referee: Mike Dean 6 .
article_snippet.sent: Referee Mike Dean is surrounded by Manchester United players as the visitors complain about a decision going against Manchester United players .
article_snippet.sent: Manchester United boss Louis van Gaal and Manchester United goalkeeper David de Gea assistant Ryan Giggs complain to referee Referee Mike Dean .