Glasgow v Castres, 7.35, Scotstoun
At present, these two occupy the bottom half of this pool, but this is moving week in the Heineken Cup and Castres will be looking for back-to-back wins over the Scots to put themselves in contention.
Their problem, as ever, is their ability to travel and, while they put it up to Ulster in Ravenhill in October, they eventually wilted.
Having beaten Northampton at home, the French side have given themselves a chance. If they can win here, they will be a serious threat to Ulster's ambitions.