The Blues are now seven points behind rivals Tottenham, who play Brighton on Tuesday evening, and their remaining Premier League fixtures are against Burnley, Swansea, Liverpool, Huddersfield and Newcastle.
However, the FA has since reviewed footage and now sanctioned the Spaniard, who has until 6pm on Wednesday to respond.More news: NFL Mock Draft: Buffalo Bills trade it all for a top quarterback
"It happened in the 43rd minute of Saturday's game [14/04/18] and was not seen by the match officials but caught on video".
Referee Mike Dean did not book Alonso for the incident, which happened directly in front of the fourth official Roger East.
The 27-year-old Spanish worldwide has now been told to respond until 6 pm on Wednesday, April 18, or face severe outcome.More news: Aguero says he's recovering after knee surgery
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.
Alonso's challenge was missed by referee Mike Dean on the south coast, and was only spoken to during the Premier League victory over Mark Hughes' relegation-threatened side.
"It was a poor tackle, and one that could have been more severe for Shane".More news: Cambridge police officers filmed allegedly beating Harvard student Selorm Ohene
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