Victor Valdes admits he was pleasantly surprised upon arriving at Boro after the goalkeeper signed a two-year deal with the club last week.
The Barcelona legend became Aitor Karanka's fifth summer signing on Thursday after leaving Belgian side Standard Liege.
"It's amazing and a big surprise for me," said Valdes when asked what he made of his new surroundings at Rockliffe Park.
"The first thing I've seen is it's a big group of good guys. The manager and my teammates have made it easy for me because he speaks Spanish.
"When you have a good atmosphere around you for the first days it's easier to feel comfortable on the pitch.
"I'm feeling good and step by step, day by day. I feel this is a good challenge for me in the Premier League and that's the main reason I signed here.
"The other main reason was the manager. Now I'm looking forward to starting with the first game against Stoke."
Negotiations have been ongoing with Valdes and Boro for a while, as the club looked to find a deal that would bring the World Cup winner to Teesside.
Valdes met with chairman Steve Gibson after committing his future to the club and says the pair discussed the new signing's relationship with the Boro fans.
"I had dinner with the owner and he said to me that I will see in the stadium and around the Boro family that the fans will love me and I will love the fans, for sure," said Valdes.
"One of the most important things in the Premier League - everywhere you go to play - is the atmosphere from the fans. It's amazing."