The midfielder struck in Sunday's 4-0 win against Celta Vigo.
Guler later said: "It was fantastic to score in such a stunning atmosphere. I'm thrilled to have scored my first goal, thanks to everyone who has supported me. I hope there will be many more to come and I will work hard to make it happen.
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"It was a good performance. I'd like to congratulate the whole team on the 4-0 win. It's been a difficult season so far, but hopefully after today better things will come. I'm really happy to be here. It's the best club in the world and, although it's tough, I think I have the quality and character to rise up to it."
He added, "When I was one-on-one with the goalkeeper, I saw that he was losing position, so I took the ball to my right and shot. Fortunately it went in and I'm very happy".