Soccer (futbol) refereeing is far more sketchy than football. In addition to the normal complaints about incompetence that all sports fans have about referees, you have the added corruption. People bitch about the refereeing the in Super Bowl, and justifiably so, but no one seriously thinks the refs are trying to give the game to a particular team (at least no one rational). Moreover, you have fans so rabid (and devoid of sense) that they make Raider Fan look like your average girl scout.
A Cowboys LB played with a Bicep tear for most of the season one of the recent superbowl year (first agaist the Bills if Im not mistaken) well I guess not that recent. However he was limited in his effectiveness wrapping up on tackles.