The newly-promoted Guinness Premiership outfit had appealed against the decision of RFU disciplinary officer Jeff Blackett but that appeal was dismissed meaning the original suspension still stands.
Best will therefore miss the next three-and-a-half months of Northampton's season, as well as Ireland's November internationals.
The ban comes just three games into Best's Northampton career after the 29-year-old joined the club from Ulster during the summer.







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