Liverpool clawed back from 2-goal deficits twice in the game before beating Leicester on penalties.
The Reds had gone down early and the master motivator Klopp found a way to pull out the incredible victory.
Explaining what was said, Kelleher told liverpoolfc.com: "We didn't get off to a great start and at half-time we're down 3-1 obviously. We were confident (at HT). The goals we gave away were our fault.
"The manager said at HT if we get the next goal the crowd will get up."
Another famous night in the books for Liverpool, whose penchant for the spectacular clearly hasn't died.