Eurosport - Dylan Hartley, Northampton Saints
The England international hooker was reported for striking his opposite number Rory Best during last Friday's Pool Four encounter at Franklin's Gardens.
Hartley will miss Saturday's Ulster return fixture in Belfast, plus Northampton's Aviva Premiership appointment at home to Harlequins on December 22.
In a statement, European Rugby Cup said Hartley pleaded guilty to the offence.
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