The Spanish left back lunged in at Long just before half time and referee Mike Dean missed the incident despite being close to the scene with a clear view.
Below is the statement from the FA as Alonso could miss the next three games for Chelsea, which include the Premier League trip to Burnley on Thursday, the FA Cup semifinal against Southampton on Sunday and the league game at Swansea next Saturday.
Chelsea’s Marcos Alonso has been charged with violent conduct following an incident with Southampton’s Shane Long. 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.
He has until 6pm on Wednesday [18/04/18] to respond to the charge.
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. Each panel member will review the video footage independently of one another to determine whether they consider it a sending-off offence. For retrospective action to be taken, and an FA charge to follow, the decision of the panel must be unanimous.
If the charge is upheld on Alonso, then Southampton will at least know he will be missing for the FA Cup semifinal as Chelsea will have their options at left wing back limited.
Yet the fact that Dean didn’t see the incident and send Alonso off at the time hurt Saints, as the Spaniard was pivotal in Chelsea’s comeback as his cross found Olivier Giroud for the first goal and playing against 10-men would have certainly helped Saints to victory in their desperate battle against relegation.