Sun Jihai must wait to see if he is in hot water with the FA after his sending off in Sheffield United's draw with Coventry on Tuesday.
The China international got a straight red card for a challenge on City's Michael Mifsud, which carries an automatic three-match ban.
But he also refused to leave the field and had to be escorted off by his captain Chris Morgan after a row with referee Darren Deadman.
Sun now faces a club fine and a battle to regain his place. Boss Kevin Blackwell said:
"Every club has rules on sendings-off and it's no different for Sun."
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