West Ham boss David Moyes was pleased with their 2-0 FA Cup win at Derby on Monday night.
The Hammers scored early in each half through Jarrod Bowen and Michail Antonio to see off a spirited Rams side at Pride Park Stadium. They now go to Manchester United for the fifth round.
Moyes said, "We have done the job and we got through.
"I didn't think we played as well as I'd have liked us to play in the whole game but, look, first half wasn't so good but we got a goal in front and we played a bit better in the second half and got the goal early which gave us a good chance.
"So, look, job done. Getting through in the cup is always important and we did it relatively well.
"Every time I mention Kidderminster, I nearly take a deep breath because you can quickly go out the cup, it doesn't matter who you play.
"But this was a difficult game because they've gone 16 games unbeaten. I don't really care what league you're in because the big thing is you get momentum or you're playing well.
"You've seen that with Wrexham and you've seen it in other cup games too over the years when they become difficult.
"In the end, we got the goals and Jarrod got another goal which helps and Micky got another goal tonight and, in the main, we probably did a pretty good professional job on them.
"I think the biggest thing for me is that I want to have a squad of players who are all driven to play and we can put any one of them into the team.
"We looked tonight to get Flynn Downes, Ben Johnson and Pablo Fornals minutes as they've maybe not has as many as I'd like to have given them.
"But they have to show by their performance that they can step in and the other thing, because we've got European football coming up, I want to see which of the boys can play on a Thursday and a Sunday when we're going to play hugely important Premier League games.
"I wanted to get through in the cup and we did. I want to give the supporters something to shout about, whether it's a European final or a cup final at Wembley. One of them would be great."