We don't need to change the way we play, we can do it all off the field.
In the run up to the match Poch could say "Last time he reffed us in a semi final he was weak and got a lot of decisions wrong. This time we expect him to give all the decisions Chelsea's way, so we'll have to be significantly better than them."
Put all the pressure on the ref ahead of the match and ensure that he can't help the opposition like he did.
If he does it anyway, he can say something like "Clearly Atkinson hasn't been bought by dodgy Russians, i think he's too honest for that. But if he had been bought, that's precisely how his performance would have looked."
Keep himself the right side of the FA, but really pressurise the authorities into watching people like him carefully.