Monreal, who has nine caps for World and European champions Spain, could make his debut in Saturday's home clash with Stoke.
"I spoke to Santi, we had a long conversation about things. I asked how things were here and he only had very positive things to say," Monreal said in an interview with Arsenal Media.
"He said that the club was a massive club, the people are great and it's really just a big family.
"As there's a familiar face in Santi, I am a lot calmer about things. Having shared a dressing room with someone who's already made this journey is a good feeling. Now it's my turn and I can't wait to follow in his footsteps.
"I am sure we can be successful this season and I am really looking forward to the challenge."
Monreal is also confident he can handle the speed and strength that is the hallmark of England's top flight.
"The Premier League is one of the strongest there is and everyone knows about it," he added.
"It is a completely different way of playing to the Spanish League - it's a lot more physical, for example. As the days go by I will get used to things and I will give my all."