The Portugal international played in Dinamo's extra-time victory over Red Bull Salzburg, which secured their place in the Champions League group stage.
And after the match he admitted it had been a bittersweet evening for him as he prepares to head to Stamford Bridge.
"At the same time I am happy and sad," he told Dinamo's official website. "This was a beautiful story, but I got a chance to go to a big club. It is the opportunity of lifetime and I think I deserve it.
"I am leaving Dinamo with the club qualified for the Champions League and I am thrilled with that success. I hope people will remember me in Zagreb as a person that always gave his best for the club and the fans and that everyone will keep a nice memory of me.
"I sure will have great memor of Dinamo and Zagreb and all people I played and worked with here.
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