Spurs had opened the scoring at White Hart Lane and looked comfortable before Leonardo Ulloa took advantage of Spurs’ failure to clear a corner to equalise.
Then in injury time Jeffrey Schlupp's effort squirmed beyond goalkeeper Vorm, who would have expected to do better.
Speaking after the match, Pochettino admitted that his side needed to kill the game and not give Leicester the chance to get themselves back into the FA Cup clash, but refused to criticise the Dutch goalkeeper.
“This is football and sometimes to make a mistake but this is the way it goes,” Pochettino said about the keeper’s costly mistake. “Michel has experience and we need to keep working and fix the mistakes. 1-0 at 83 minutes I am upset by this.”
The former Swansea City goalkeeper has not had much game time since his move from the Liberty Stadium in the summer transfer window, and this showing will not have convinced Pochettino that he deserves to be starting ahead of first-choice custodian Hugo Lloris anytime soon.
Spurs now take on Sheffield United in the second leg of their Capital Cup semi-final tie, and the manager says that his side will have to keep up their confidence and motivation to reach the final of a competition they will think they have a strong chance of winning.
“It is important to keep our motivation and confidence because we need to play Wednesday because we are expecting a really tough game,” he added.