BBC News
Simon Stone - Chief football news reporter
How do add-ons work in football transfers?
Our Ask Me Anything team examine exactly how extra amounts added on to transfer fees really work.
Many of this summer's transfer window deals have been stated as a base fee plus 'add-ons'.
For example, Rayo Vallecano's Pep Chavarriahas joined Chelsea in a five-year deal worth about £16.3m - plus… [+3779 chars]
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