LONDON, ENGLAND - JANUARY 05: Manuel Pellegrini of West Ham United looks on prior to the FA Cup Third Round match between West Ham United and Birmingham City at The London Stadium on January 5, 2019 in London, United Kingdom. (Photo by Alex Morton/Getty Images)

West Ham manager Manuel Pellegrini has praised his side’s “big team mentality” after their 1-0 victory against London rivals Arsenal.

Declan Rice’s lone goal was enough to seal all three points for the Hammers and Pellegrini was pleased with all aspects of his team’s performance.

“We were balanced in attacking and defending and we didn’t allow Arsenal to create chances,” he told the club’s website.

“We saw that they had many good attackers – Aubameyang, Lacazette, Ramsey, Iwobi, all of them, players who make a difference – but I think they had one chance at the beginning that Lukasz Fabianski saved.

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“The second thing I was pleased with was that we played with the mentality of a big team. From the first minute we tried to score, so I’m happy for that.

“You have to work in the week the same way you play on a Saturday. You can’t think you’re playing Arsenal so you have to play with all your team defending, and then the next week you’re playing the teams who are not so big and you work a different way.

“We always work in the week the same way, we always try to play the same way. Of course with some characteristics and tactical things for the other team, but the principle for us is to improve in the way we play.”