Phil Parkinson felt referee Andy Haines was right to send off Brentford keeper David Button.
Haines showed a straight red after Button went in high on Nahki Wells. City went on to win 4-0 against ten men.
Brentford are considering an appeal against the decision but Parkinson thought the official was spot on.
He said: "I thought it was one of those tackles that can injure someone seriously."
Wells picked up a slight shoulder injury but was unable to continue until later in the game - and scored his seventh goal of the season.
James Hanson scored twice and Garry Thompson also headed home.
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