The Portuguese international received a kick on the shoulder during Saturday’s win over Chelsea, but Sir Bobby explained that the injury was to the other shoulder and is nothing to worry about.
"I can understand this but actually it was Hugo's other arm. It wasn't the shoulder that had been dislocated," he told The Journal.
"But it was still very painful for the lad because he had been kicked right on the muscle - and if I did look concerned this was the reason."
Despite this Viana may still find himself missing out on Wednesday night as Laurent Robert is available again after suspension.