Reyes was back in London last week for Atletico's Champions League thrashing at Chelsea.
And he told the News of the World: "Playing in England was a massive experience for me. Even if people don't think I made it here, I grew up as a human being and learnt a lot.
"Anyway, I keep good memories of my spell with Arsenal, which is a club I'll always respect. Playing in this country was an opportunity. But I was homesick and decided to move back to Spain."