The 23-year-old has been in sensational form this year but his yellow card against the Italian side means he will miss the second leg of the tie in Turin - and he has now been cautioned by officials on four occasions for diving.
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"I wouldn't describe Gareth as a diver," he told Mirror Sport. "These are decisions a referee has to make because it's their job. But when Gareth is running at pace it's so difficult and it can be borderline. The referee makes his decision and it can go one way or the other."
Allen is no stranger to such controversies, with team-mates of his being accused of simulation at both international level (Bale) and club level (Luis Suarez). But he suggests that both stars are unfortunate to be targeted - and is thankful he can play with both of them.
"These allegations are made sometimes in football and it's difficult to say if they are exaggerated," he continued. "Gareth has taken it to a new level this season. He is in the form of his life. I'm lucky to play with both. I play club football with Luis week in, week out, and he's incredible."