England wing Chris Ashton is in danger of missing the Six Nations after being cited for allegedly making contact with the eye area of Ulster centre Luke Marshall.
Saracens maintained their 100 per cent record in this season's European Champions Cup with a 33-17 win over Ulster on Saturday.
But the victory may come at a big cost to Ashton, who was selected in Eddie Jones' first England squad earlier this month, with European Professional Club Rugby (EPCR) revealing he has been cited for making "contact with the eye(s) and/or eye area" of Marshall in the 16th minute at Allianz Park.
Ashton's last England appearance was in 2014 and his wait to return for the national team will continue if he is found guilty by the EPCR.
The minimum suspension Ashton can receive for such an offence is 12 weeks, although a guilty plea and other mitigating factors such as contrition and a previously positive disciplinary record can trim time off a ban.
A mid-range offence warrants an 18-week suspension, while the maximum sanction that can be handed down for a top-level infraction is four years.
Should Ashton receive a 12-week ban, then he would be unavailable for the entirety of the Six Nations, which starts on February 6. England open their campaign against Scotland at Murrayfield.
Ashton has 19 tries for England in 39 matches.