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Published 15:52 29 Oct 2015 GMT

Players are tested for the prohibited substances via the collection of blood and urine samples. All tests are collected by Doping Control Officers (DCO) and Chaperones, who are accredited to World Anti Doping Code (WADC) standards.
But poor Fabregas isn't too happy about being chosen for a 'doping surprise', judging from his Snapchat post below. Perhaps the authorities are trying to get to the bottom of his woeful form...
![Cesc Fabregas complains about another Chelsea doping test [Snapchat] Cesc Fabregas complains about another Chelsea doping test [Snapchat]](http://i.imgur.com/NEgFNsr.jpg)
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