Klopp opted to throw in the Irish goalkeeper for his appearance in Europe’s premier competition, with Alisson Becker currently out injured.
Adrian has typically stepped in for the first-choice Brazilian, although Kelleher did make a handful of appearances in domestic cup competitions last season, but he had to make do with a place on the bench for the 1-0 win at Anfield.
Kelleher took his opportunity with both hands, making a string of impressive saves and showing great composure with his feet as Liverpool secured their spot in the last-16.
Klopp was delighted by Kelleher’s performance, particularly given he didn’t know how the 22-year-old would ‘cope’ with the expectations that accompany playing at the very top level.
And the Liverpool manager explained that Kelleher’s ability with the ball at his feet saw him play ahead of Adrian – who will now do well to win his place back in the Premier league tie against Wolves on Sunday.
‘I really think Adrian has done a fantastic job for us, he kept a lot of clean sheets, played everywhere,’ said Klopp after the match.
‘But now we needed the natural football playing ability of Caoimhin Kelleher. He is a good shot stopper as well.
‘We made that decision but you never know how they are going to cope.
Liverpool are guaranteed to go through as Group D winners after the 1-0 win after Atalanta could only muster a draw against Midtjylland.
Ajax and Atalanta will meet in the final group stage match to see who joins the Reds in the next round. Ajax need to win, while a draw will be enough for the Italian outfit to qualify.