Tony Pulis was relieved to see Stoke progress to the FA Cup quarter-finals but furious at Rory Delap's 17th-minute dismissal.
Last year's losing finalists avoided a fifth-round upset against Crawley - the lowest ranked side left in the competition - thanks to goals from Jon Walters and Peter Crouch. Stoke will now feature in the quarter-finals for the third year running, despite Delap receiving a straight red card for a challenge on David Hunt.
Potters boss Pulis said: "There is a big problem within the game in that I think professional people and referees are so far apart in what they see in terms of what are fair challenges or competitive challenges and the bad, reckless challenges. Like I say, that is the disappointing thing. The sometimes enormous gap between what we think and they think."
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