TV footage showed Alonso catch Long on the calf with his studs shortly before half-time in Chelsea's 3-2 victory at Southampton, but referee Mike Dean and his assistants missed the incident and consequently took no action.
Chelsea face the prospect of losing wing-back Marcos Alonso for their crunch FA Cup semi-final showdown with Southampton on Sunday after he was charged with violent conduct by the Football Association (FA).
Should Alonso be suspended for three games, he would miss Chelsea's top-flight clash with in-form Burnley tomorrow, the FA Cup semi-final and the Blues' trip to Swansea later this month.
An FA statement read: "Chelsea's Marcos Alonso has been charged with violent conduct following an incident with Southampton's Shane Long".
The 27-year-old Spanish global has now been told to respond until 6 pm on Wednesday, April 18, or face severe effect.
'Off the ball incidents which are not seen at the time are referred by The FA to a panel of three former elite match officials.
If that is the case, a three independent panellists then individually rule on whether Alonso's tackle warranted a red card and, if the decision is unanimous, an FA charge can be brought.
Southampton boss Mark Hughes was disapproving of the tackle at the time.
"The disappointment was the officials didn't see it, they were all within a 10 to 15 metre radius".
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