Ashton was banned for 10 weeks for eye-gouging an opponent, ruling him out of the tournament after being recalled following an 18-month absence.
Rokoduguni, 28, won his only England cap against New Zealand in 2014.
England begin their Six Nations campaign in Scotland on Feb. 6 and Ashton has three days to decide whether to appeal against his suspension.
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(Reporting by Ed Osmond, editing by Pritha Sarkar)
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