The German spent most of his debut season playing second fiddle to rival Simon Mignolet following his move from Mainz in 2016, but he always had faith in his own ability.
The 24-year-old is now the number one choice at Anfield and has been impressive between the sticks, keeping eight clean sheets out of their last 12 games, but he says he always new he would make the grade and, had he doubted it, he would have been off.
"Sometimes it doesn't go so quick and as a goalkeeper you have to be patient and just wait for it," Karius told the club's website.
"If I didn't believe it then I would maybe have said in the summer that we need a solution but I believed in it 100%, that's why it was always clear for me to fight my way back into the team.
"I'm happy that I was patient."