So, in the Champions Cup:
Leinster v Toulouse (at the Aviva, of course, 29th April)
La Rochelle v Exeter (at Std. Matmut, Bordeaux, 30th April)
And in the Challenge Cup:
Scarlets v Glasgow (at Parc y Scarlets, 29th April)
Toulon v Benetton (at Std. Felix Mayol, 30th April)
La Rochelle game at Std. Matmut (capacity 42,115) rather than Std. Marcel-Deflandre (capacity 16,000).
So... Jack in the Toulouse side, Jacob and Marcus in the Benetton side, and Exeter have a few ex-Wasps, but I imagine only Frosty likely to play.