Hull have appealed against midfielder Tom Huddlestone's dismissal in Saturday's Premier League defeat at Everton.
Huddlestone was shown a straight red card by referee Paul Tierney following his challenge on Idrissa Gueye midway through the second half.
City boss Marco Silva was not happy after the game, saying: 'I don't want to talk too much like the decision, but it didn't look like a sending off and my players say that too.'
Even Everton manager Ronald Koeman conceded that the red card shown by Tierney was 'harsh'.