Liverpool youngster Fabio Carvalho insists he has to "step up" when he is asked to do a job by his manager.
The youngster came on for the Reds with the scores still level against Manchester City at the weekend.
Liverpool went on to win the game 1-0 through a Mohamed Salah goal.
Carvalho knows with injuries piling up, he will have to deliver when he is called on.
"You want to come to Liverpool to play with the best and play on the biggest stage, which is what the game was the other day. But we'll just keep building our momentum and keep going," Carvalho told <>Liverpoolfc.com.
"We enjoyed the win because we deserved it, so we kind of celebrated – as we should, every win's important, especially this year in the Premier League. But we have to focus on West Ham because they're a tough team to play against, so we're just focused on that now."
He added on performing: "That's something I felt because it was 0-0 and the manager obviously felt good and trusted in me to put me on. Not just for the team but for myself, it's something to build on and we'll keep going.
"I've got to step up when needed – whether I start or come on. Regardless of what I do, I just need to be able to come on and produce. We'll see what happens."