A single hamstring injury in the 14th minute of a Premier League game and poof, there goes the £69.2million package you agreed with Bayern Munich for .
There goes the private flight that was paid for. It was a waste, another one is required for the return. There go all those hours that went into negotiating a £12.9m loan fee with a £56.3m option, not forgetting the sell-on clause that Chelsea would have retained.