The Brazilian youngster struck in the Carabao Cup win at Wolves in midweek.
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"I’m so happy to score my first goal for Chelsea," the 21-year-old told the club's website.
"This moment is amazing in my career, and my wife and my parents know that I’ve always dreamed of this. I’m so happy to score. It’s been a process; that's normal. Now I’m here, I’m so happy."
Santos added, "We have to play like we did in the first half because we played with joy. In the first half, we worked hard and got to 3-0. In the second half, we were disappointing.
"We need to keep going, keep ahead and keep improving. The most important thing is that we were able to get the win and into the quarter-final."