The Foxes overcame Brighton on penalties in the Carabao Cup on Wednesday after the match had finished in a 2-2 draw.
"It was a good victory for us," the Northern Irishman told LCFC TV. "Of course, whenever you've got lots of players coming in who haven't had a lot of game time, I thought we looked a little tired in the second half.
"But what you can't question is the players' mentality and their spirit. They showed great qualities, especially when they got the equaliser and we were able to score straight away. I'm delighted for the guys. They had to work very, very hard for it.
"Brighton are a good side, you can see they pass the ball well, but we always looked a threat. Your spirit can never be broken. There are some teams that can get pegged back and just don't have that belief.
"We've always said our mindset is: 'Listen, you're never going to have it all your own way'. If you do go behind, or you do go level in the game, you keep pushing right to the very end."
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