Goals from Gabriel and Emile Smith Rowe in the opening 20 minutes at King Power Stadium sent City on their way to a first loss in six games in all competitions.
"A poor start cost us," he told LCFC TV. "It's a lack of concentration and then you're chasing the game against a good side. We've been able to do it in a few games recently where we've not bad a great start and come back, but you can't give teams a 2-0 start, especially a good team like Arsenal.
"We were too passive, so it is a concern. When you have players finding the level and the constant mentality, if you don't start the game well, then it can cost you and today it cost us. In the second half, we can't have any complaints. I thought we were excellent.
"We had to make changes to shift the dynamic of the game, but we got punished for that opening 20 minutes. Both [Harvey Barnes and Ademola Lookman] were excellent. They gave us that pressure higher up the pitch. We could condense the game up there and we were much better."
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