The 20-year-old scored the winning goal against Real Madrid in the Champions League on Tuesday night.
And the Croatian insists he is happy and focused on life in the Russian capital.
"It was probably the biggest match of my career so far," he said, via UEFA .
"Do Everton regret letting me leave on loan? I wasn't getting to the team so I came to CSKA and am very happy to be here and playing in big games like this."