Oh, all right. Manchester City were playing at home, so they'd provided masses of balloons in their club colours of pale blue and white.
After the game had started some of these balloons had drifted into the area in front of Manchester City's goal.In the course of play the ball, also white, got mixed in the balloons. What happened next is debatable. They say that the ball was deflected by a balloon (unlikely, considering the relative masses of a balloon and a football ). What it looked like was that their defender went to kick the ball away but was distracted by a white balloon near it and mishit. This knocked the ball right into the path of an opposing player who shot it straight into the net for the opening goal

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There was a 'post mortem' in which the home team blamed the referee (naturally), claiming that they'd sought his guidance before this happened. He must have wondered why they couldn't sort it out themselves, but told them to have their goalkeeper burst the balloons while play was at the other end.
The truth is that the club must have had stewards, ballboys and other employees to clear the pitch before the kick off, but you can't expect the club to admit blame, can you?

By the way, Chelsea players would never lose cash from their changing room. They don't know what cash is ! Gold bars, platinum credit cards, banker's drafts, accounts at Harrods, yes. Cash? What's that?