There was no obvious injury and the 22-year-old Brazilian born goalkeeper played on, saving a penalty taken by Cristian Canuhe in the 89th minute to earn his team a 0-0 draw.
However, afterwards he complained of severe pain in the dressing room and underwent emergency surgery after it was diagnosed as a perforated intestine.
Wanderers said the operation had gone well and Viana was expected to recover in around four weeks.
(Writing by Brian Homewood in Berne; Editing by Pritha Sarkar)
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