Kelleher warmed up Alisson and Simon Mignolet before Liverpool's 1-0 win over Brighton on Saturday and the Liverpool Echo reports that Klopp is "blown away" by his development and has made him number three at Anfield.
"He is an outstanding talent. Outstanding. Very cool with the ball, you saw that in pre-season when he played in front of 100,000 people, that he wasn't bothered about that which is a very important skill to have," said Klopp, in quotes reported by Balls.ie.
"For most of his youth he was an outfield player, he has fantastic reactions. If nothing serious happens, he will have a really fantastic future. I don't know how many really good goalkeepers that Ireland have but one more is never a big problem. I like him a lot and he will be in our squad."