Saracens are only two points ahead of their French rivals and three points ahead of their Irish rivals and need a victory at the Stade de la Beaujoire in Nantes to cement their position as Pool leaders.
The French side have taken all of their home Pool games on the road and they travel to Nantes to host the English side who moved one of their home games to Belgium during this campaign.
Saracens recorded 30-13 victory over Racing Metro when the two sides met in front of a 18,000 crowd at the new King Badouin Stadium in Brussels back in October and the form of Owen Farrell could be crucial.
Racing Metro will be full of confidence after they became the first side to beat Top 14 leaders Toulon at home last weekend and will be looking for a home victory over Saracens.
Both sides, however, will have one eye on Munster's trip to face Edinburgh on Sunday, knowing the Irish province are very much in the battle for a Heineken Cup quarter-final place.
- Saracens have triumphed in two of the three Heineken Cup meetings between these teams, including a 30-13 success earlier this season. The first two clashes were settled by margins of five points or fewer.
- The French side opt to kick the ball in open play more often than any other side in the Heineken Cup this season (34 times per match).
- Steve Borthwick has won 25 line-outs so far this season, including two steals, more than any other player in the competition.
- Saracens have a 50-50 win/loss record against French opponents in this tournament, winning eight and losing eight. Away from home their overall record is the same, they have won 10 and lost 10.