Leicester boss Brendan Rodgers was left frustrated after the defeat to Southampton.
Saints won 2-1 at the King Power stadium.
Rodgers said, “It was a culmination of everything. We’ve been here the last time, 2-0 up and we stopped taking the ball and gave the initiative to them [in the 2-2 draw with Brentford on an opening day].
“We started the game very well – with energy, intensity, passing, movement. We deserved to go in front and then we stopped. You have to be able to manage the game. We sunk deeper and they gained confidence after scoring out of nothing.
“It was a very frustrating game. The players’ attitude and energy was what you’d want. Once we went in front we did what we have been doing. It’s just constant work.
“It was important for us today that we managed the ball when we took the lead but we didn’t do that. We looked nervous. That’s a little bit of desperation in wanting to get the result.
“The players are really good lads. We’ll go away and look to improve.”