He will appear at a hearing over his sending-off in Friday's European Champions Cup match.
The 30-year-old New Zealand-born hooker -- who has served 54 weeks of suspensions in his career because of various disciplinary issues -- will appear at a hearing over his sending-off in Friday's European Champions Cup match between his side Northampton and Irish province Leinster.
He had been on the pitch for just six minutes when he was given a red card by referee Jerome Garces for swinging an arm at flanker Sean O'Brien, who subsequently failed a Head Injury Assessment (HIA), and with England coach Eddie Jones sitting in the stands.
Jones surprised many in appointing Hartley captain when he took over after the 2015 World Cup. But the choice proved inspired with Hartley captaining the side to a record-equalling 14th successive win just over a week ago. Nevertheless Jones was seen running his hand down his face at Hartley's dismissal.
Northampton's director of rugby Jim Mallinder said he could not defend Hartley over the sending off.
Hartley runs the risk of an eight-week ban, jeopardising his chances of captaining England in the Six Nations and leading the British and Irish Lions in New Zealand next year.
England -- who if Hartley is unavailable could well be captained by kicker Owen Farrell -- begin the defence of their Grand Slam against France at Twickenham on February 4.
Hartley's sorry disciplinary record includes suspensions for head-butting, biting and gouging.
He was dropped by then England coach Stuart Lancaster -- now on the coaching staff at Leinster -- for the 2015 World Cup after headbutting Saracens' Jamie George.