The midfielder spoke to the club's own media about his move from Udinese.
"It's a huge club, but the people here make it feel like a family," he said.
"This was one of my dreams. I fulfilled that dream and I want to make history at this beautiful club.
"The group have welcomed me really well. I'm really happy and trying to adapt and get used to the team."
Working with Diego Simeone is something that's particularly special for the Argentine and thinks he'll really help him with his development.
"To be coached by one of the world's best managers is incredible," he added.
"His career and achievements speak volumes and will never be forgotten.
"I will learn so much from him and that motivates me a lot. We understand and feel football in a very similar way.
"I'm convinced that competition for places will make all of us better. I'm here to compete and help the team."
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