Coming on the back of a league defeat by Aston Villa, it made victory in Saturday's clash very important for Pellegrini's side.
The Chilean said: "I was very pleased for a lot of things. We played the only unbeaten team in the Premier League and a team that plays very well with the ball so it was not an easy game.
"What happened last Wednesday always has a consequence physically and mentally on the team so that's why I am very pleased with the character the team showed."
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