Mikel Arteta says Arsenal showed "great fight, determination, brotherhood" in the draw with Liverpool at Anfield on Thursday.
The Gunners secured a goalless draw in the Carabao Cup semi-final first leg despite playing with 10-men for over 70 minutes.
"We revel against the situation," Arteta said after the game. "The players showed great fight, determination, brotherhood. You saw the emotion, we never gave up. Credit to the boys.
"I don't know if the red card inspired them but it took the fight. You need a certain attitude to play in these games and the boys did that. We played the game we had to play, which is not our game. I have not seen it back, they checked it so probably a red card.
"To plan with the numbers we have, we don't have any midfielders, becomes really complicated, because whatever we do is not natural.
"The extra motivation to play a derby [at Tottenham on Sunday] brings the energy when you don't have it. No excuses, we have to play it."