Manchester City will appeal Vincent Kompany's red card at Arsenal, Roberto Mancini has confirmed.
City's captain was sent off towards the end of a 2-0 win after referee Mike Dean ruled he had tackled Jack Wilshere two-footed.
Kompany is facing a three-match suspension which could be increased if the Football Association decides any appeal is frivolous.
But asked whether City would fight the ban, Mancini told Sky Sports: "Yes. This is absolutely not a red card. He has one foot taking the ball, the other is back. I think the referee made a mistake."
Kompany's dismissal evened the numbers following Laurent Koscielny's early red for hauling down Edin Dzeko, and although the striker missed the resulting penalty he went on to add to James Milner's first-half goal.
The result kept City within seven points of leaders Manchester United, but the manager was frustrated by his forwards' failure to kill off the game long before the end.
He said: "It was easier after the (Koscielny) sending-off, but in the second half we were too soft and missed three or four goals.
"We could have done better with our strikers when we attacked in the second half because we needed to close the game."
Asked about United's lead at the top, he said: "We know United are strong, but the season is long and we need to work."