The goalkeeper was a late replacement for Stephen Bywater and told the Derby Telegraph: "To come in and play your first Premier League game against Liverpool is a bit different.
"I thought I did alright but there are still a lot of things I can improve on.
"I'm happy to play but we wanted a result."
He added: "Hopefully, I can play a few more games and go on from there.
"Liverpool are one of the biggest teams out there so, whatever I come up against, I should be alright.
"It's just nice to get my first game out of the way."