Chelsea's Ryan Bertrand has been forced to apologise after using an expletive on Twitter to condemn reports he had pulled out of England's World Cup qualifier with San Marino with a "sore throat".

The FA's official description of the illness that has prevented Bertrand from training since Monday was clearly viewed as an insufficient explanation of his condition.

"Just to clarify.... Its not a "sore throat" Im ill. swollen glands in my neck... And constant headache for 3 days now and freezin cold," Bertrand explained on Twitter. "Do you think a "sorethroat" could stop me being apart of a match for my club or country? #yourf******nuts this is what every boy dreams of."

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