Warriors staged a full-blooded fightback to claim a bonus point in Clermont.
Warriors' final two ERC Challenge Cup matches have been confirmed as the team moves into final preparations for Saturday's clash with Albi at Sixways, the third of six Pool 5 encounters.
As expected, the home clash with ASM Clermont Auvergne will take place on Saturday, January 13, with a customary 3pm kick-off.
Warriors picked up a late losing bonus point after a hard match in the hostile atmosphere of Parc des Sports Marcel Michelin in October.
A week after meeting the French side, the group stages will conclude with a visit to Stadio Luigi Zaffanella for the return match against Viadana, which is also a 3pm kick-off (local time).
Warriors defeated their Italian opponents 25-7 in the opening round of the cup, at the start of October, following a 35-15 victory in a pre-season friendly.
Niall Annett and Phil Dowson are among three changes to the Warriors starting line-up for their trip to Franklin's Gardens to take on Northampton Saints in the Aviva Premiership this Saturday (kick-off 3pm).