He also said that he was excited to be reunited with his former Malaga teammate Cazorla.
"I spoke to Santi, we had a long conversation about things," Monreal told Arsenal's official website.
"He had very positive things to say. He said that the club was a massive club, the people are great and it's really just a big family.
"As there is a familiar face in Santi, I am a lot calmer about things. Having shared a dressing room with someone who has already made this journey [from Malaga to Arsenal] is a good feeling. Now it's my turn."
Monreal also admitted that he had watched videos of Arsenal in the past and always admired their style of play.