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Saracens did manage a losing bonus point in Ireland against Munster but they need to get a win over the former Heineken Cup winners this weekend to keep themselves in with a chance of qualifying.
They will be hoping Owen Farrell, who helped kick England to glory over the All Blacks recently, rediscovers his kicking boots after he missed four penalties in the first leg against Munster.
Veteran fly-half Ronan O'Gara, who kicked Munster to victory over Sarries, will be a key figure in what promises to another compelling clash against the English Premiership side.
Racing Metro, who are only two points behind Munster and Saracens, proved their quality against Edinburgh, but they will be looking for a bonus point victory in Scotland.
The Paris-based outfit will be aware of Edinburgh's ability to cause French sides problems on their own patch - they knocked out Toulouse at Murrayfield in last season's quarter-final.
Edinburgh, who went as far as the semi-finals in last season's competition, have endured a miserable campaign this term and are still looking for their first Pool victory.
