This week's yellow card goes to Manchester City manager Manuel Pellegrini, who was not pleased by the referee's performance during his team's 2-0 loss to Barcelona.
Said Pellegrini of referee Jonas Eriksson in the post-match press conference, as per The Guardian:
He did not have any control of the game. He favoured Barcelona from the beginning to the end. I think it was not a good idea to put a referee from Sweden in charge and a referee who made a mistake against Barcelona in the group stages.
Now it's one thing to say a referee got a decision wrong; it's another entirely to accuse him of bias and dismiss an entire nation of referees at the same time.
Yellow card, Mr. Pellegrini.