Toulon - Toulon flank Steffon Armitage and prop Xavier Chiocci were on Wednesday held for questioning by police over a fight with another man last month, sources said.
Armitage, last season's European player of the year and capped five times by England, and France international Chiocci are alleged to have struck a 31-year-old man on December 13 in a restaurant where they had spent an evening drinking after Toulon's comprehensive 23-8 victory over Leicester in the European Champions Cup.
According to witnesses, a fight broke out and the two players felled the restaurant goer before striking him, injuring his eye.
Armitage, 29, and the 24-year-old Chiocci have told investigators they can remember nothing of what happened.
When contacted, outspoken Toulon president Mourad Boudjellal said that he "had nothing to say for the moment" and was awaiting "more information".
Both Armitage and Chiocci have been named in Toulon's 25-strong squad for Friday's Top 14 home match against Bayonne.