The defender has broken into the senior Portugal squad after joining the Blues this season.
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He told the club's website: "I’m just grateful to be honest, and trying to enjoy every bit. I’m very happy and proud to be here. It’s always a moment of pride to put the shirt on.
"My parents told me to always try and do my best in every situation. That is exactly what I am doing now. I always want to be the best version of myself I can be. There is no better place to do it than at Chelsea. I’m just proud.
"I want to give my best for this huge club, and win a lot of trophies. That’s what we all want. We don’t know when, if it’s today or tomorrow, but that’s our main goal and that is what we are working towards."