It was a crucial three points for the Hammers as they battle to get out of bottom three.
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“It’s always important to score,” he said. “A striker always wants to score goals, but I haven’t been able to do that in previous games.
“I’m very lucky to be able to defend this shirt. I’ve been given the opportunity to be here and I have to defend it to the end. Obviously, I’m very happy for my first goal here in the Premier League.”
Castellanos added: "We have to go on this path, defending that shirt. The most important thing is that we’re all working together.
“Important games are coming up. We have to go step by step, training after training, which is what the coach always tells us, and we’re going to continue on this path, which is important for us.”