In Pool Four Biarritz and Saracens look a class above Glasgow and Italian minnows Viadana.
The blind-side suffered medial knee ligament damage in Leicester's Heineken Cup win over Viadana on Saturday.
He will miss the regions first four matches of their pool, which includes Clermont Auvergne, Leicester and Viadana.
However, Sean Lineen's side showed signs of promise last season, with a battling win over Biarritz at Firhill and a home and away success against Viadana.
The Welsh region will face different Italian opponents this term, with Carrera Petrarca, Benetton Treviso, Cammi Calvisano and Arix Viadana involved in the Italian league's top four play-off.
By the 13th minute the game was already shaping up for a Munster rout as Foley broke the Viadana line on the right wing and passed outside to Anthony Horgan.
Petrarca will take a slim 20-18 lead to Treviso after the weekend's first leg of the semi-finals, while Calvisano hold a 19-10 advantage as they travel to Viadana this Saturday.
Matters grew more depressing for Viadana in the 22nd minute when second row Fabio Gumiero was sent to the sin bin for what appeared to be dissent towards referee Hugh Watkins.
Viadana, who had lost 71-7 to Saracens last weekend, were clearly taking this game more seriously and made 10 changes - with recalls for Italian internationals Kaine Robertson and Josh Sole.
Haughton's score, which came four minutes into stoppage time after he rounded two forwards on the wing, broke the hearts of a Viadana side that have yet to win a game in this year's competition.
Hare will have the opportunity to cast his eye over the academy prospects when the Saints Under-19s play their counterparts from Leinster on Friday, 27 August, prior to a first XV fixture against Viadana at Franklin's Gardens.
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