The 28-year-old Saracens player, recalled to the England squad for the first time in 18 months, was cited for making contact with the eyes of Ulster's Luke Marshall during a European Champions Cup match.
Ashton pleaded not guilty at a hearing last week and is appealing against the severity of the punishment.
England begin their Six Nations campaign in Scotland on Feb. 6.
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(Reporting by Ed Osmond; editing by Amlan Chakraborty)
