The Croatia international finished the season superbly, but admits he struggled in the beginning.
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Gvardiol told the Daily Mail: "I woke up and started performing. I made a lot of stupid mistakes last season. I had to learn to play more simply and that's what I did at the end of the season.
"Before, I just played the ball to the first teammate I saw.
"I went through a period without confidence and that is very normal."