Arsenal boss Mikel Arteta told BBC Sport: "The game the way it went, I felt we had total control in the first half and restricted them to nothing. We were winning every ball, created a few chances and scored a goal I don't know how it got disallowed. They defended deeper in the second half, waiting for the mistake and in one moment they did it,
"Against this block, against well-organised teams, when you open them up you have to put the ball in the back of the net. They were similar against Manchester City, they scored with two set-pieces and credit to them for what they have done but our players responded and I feel sorry for them."
Leicester manager Brendan Rodgers told BBC Sport: "The boys were outstanding - against top quality players, you have to deny them space. You set up slightly different for the game. They executed it really well.
"We deserved it, we played against a really good side and have players who can run in behind. To keep a clean sheet and play with the quality and calmness was good."