Castres , France - 20 January 2017; Robbie Henshaw of Leinster goes over to score his side's second try despite the tackle of Steve Mafi of Castres during the European Rugby Champions Cup Pool 4 Round 6 match between Castres and Leinster at Stade Pierre Antoine in Castres, France. (Photo By Stephen McCarthy/Sportsfile via Getty Images)
Leinster's centre Robbie Henshaw (R) is tackled by Castres fly half Julien Dumora (L) during the European Champions Cup rugby union match between Castres and Leinster on January 20, 2017 at the Pierre Antoine Stadium in Castres's southern France. / AFP / REMY GABALDA (Photo credit should read REMY GABALDA/AFP via Getty Images)
Castres , France - 20 January 2017; Isa Nacewa of Leinster is tackled by Brice Mach, left, and Steve Mafi of Castres during the European Rugby Champions Cup Pool 4 Round 6 match between Castres and Leinster at Stade Pierre Antoine in Castres, France. (Photo By Stephen McCarthy/Sportsfile via Getty Images)
Castres , France - 20 January 2017; Robbie Henshaw of Leinster on his way to scoring his side's first try during the European Rugby Champions Cup Pool 4 Round 6 match between Castres and Leinster at Stade Pierre Antoine in Castres, France. (Photo By Stephen McCarthy/Sportsfile via Getty Images)
Castres , France - 20 January 2017; Robbie Henshaw of Leinster on his way to scoring his side's first try during the European Rugby Champions Cup Pool 4 Round 6 match between Castres and Leinster at Stade Pierre Antoine in Castres, France. (Photo By Stephen McCarthy/Sportsfile via Getty Images)
