The €75m signing from Liverpool featured in Saturday's 2-1 victory.
Advertisement
Advertisement
Afterwards, Diaz said: "We controlled the game and I think I personally played a good game. My first impressions at the club are fantastic. I'm very happy.
"I need some time to get into it and get to know my teammates so I can help the team get better."
The attacker also said, "I said it on the first day too, that I want to win all possible titles at this club and contribute with my football, with my goals and assists, even if I sit on the bench sometimes.
"I will always try to be available to the coaches and I hope we have a fantastic season."