"It's such an amazing feeling, you know?" Maatsen told CBS.
"I've been dreaming of this since I was a kid, especially scoring my first goal in the Champions League. I'm so happy I can't even describe it.
"I always believed (I could) play for Chelsea, but unfortunately it didn't work out.
"Now I'm here I'm very grateful for the opportunity. I'm very proud of myself. I kept believing in myself and came here to play my game at the highest level. Today I think I showed a very good performance.
"These opportunities don't come often for full-backs and I've been practising in training.
"I got a good touch in the box and I saw the goal and just put it in the net as hard as I can. Today it paid off.
"This Yellow Wall is insane. You felt the energy from the fans and you feel such a buzz. You feel it so much in your heart. It goes all through your body. Great fans. I can't describe it."