Sanchez played in the defeat to Stoke City after three games on the bench.
"In this English game there is not a lot of transition," he told the Birmingham Mail.
"It switches from attack to defence in a flash.
"I was used to a game with more control, like in Spain.
"It cost me a bit at the start but the (ex) manager (Lambert) kept telling me he understood that and my team-mates, too.
"I feel as though I have got used to it now and I feel a lot better.
"You have to always be looking behind you and be up to speed - have the tempo of the game.
"The language was fine because football is the same language."