That penalty was no where questionable, that should have been clear yellow for Suarez for diving.
One of the worst CL calls in such a big match.
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Clear penalty? Not even Suarez noticed he was ran behind which was normal because there was no intention of fouling him and both were running towards the ball and it was far away from any danger and when Suarez fell down he grabbed his neck

because he didn't know what else to do and the ref fell for the fact he held his neck falling down and now because he was ran straight into the back of him. Plus the contact wasn't even worth looking at.
Why are you defending that call?