Investec Champions Cup: five things to look at in the last 16

Saracens They opted to pursue domestic success on their continental ambitions this season.
The three times winners of the Champions League Cup have decided to Rest many of their internationals in England, including Maro Itje and Tom Willis, for their trip to Tolone.
Rugby Director Mark McCall claims to give priority to play the Premiership play-offs for the occasion for a fourth European crown.
Northampton SaintsIn the meantime, I am the only English side with a tie at home after finishing the top of the swimming pool 3.
The saints are eighth in the premiership table after enduring a sad defense of their title, but the part of Phil Dowson will host Clermont in a welcome recovery from their national campaign.
Visitors are in sixth place in the top 14 of France after their recent victory over La Rochelle concluded a series of five consecutive defeats of the League.
Clermont booked their place in the direct elimination phases by snatching a dramatic 33-26 victory at the sixth minute of the extraordinary to qualify at the expense of Bath and Bristol.
Elsewhere, Sales sharks face a discouraging journey six times winners and defend the samples of Tolosa, which will be Without Talismano injured Antoine Dupont After breaking the crocrat ligaments on their knees during the six nations in France they won Ireland last month.
Arlequins face an equally difficult task to the four times Leinster winners, while Leicester Tigers Travel north to face Glasgow Warriors.