The Football Association is investigating Chelsea full-back Marcos Alonso’s tackle on Shane Long in his side’s 3-2 win against Southampton last Saturday.
The Spaniard appeared to stand on the back of Long’s calf in the first half when the Blues were losing 2-0.
If Alonso is charged with violent conduct he will face a three-game ban and would miss Sunday’s FA Cup semi-final against the Saints.
He would also miss Premier League games at Burnley and Swansea in the next days.
The FA can take retrospective action if referee Mike Dean or any of the other officials failed to see the incident.