Since signing for Arsenal in August, Perez has made just two league starts, leading to rumours he could make an early departure from the London club.
However, the 28-year-old insists he is now adapting to English football and is happy in Arsene Wenger's side.
"It was still quite a change for me to get used to the English league when I moved here from Spain," he told Arsenal Player.
"Everyone needs some time to adjust. Players are all different, so some take longer to adapt than others.
"Now I feel really comfortable and I've fitted in well to the team – that's particularly important for a player."
Perez has scored seven goals in all competitions this season, including in the 2-0 FA Cup defeat of Sutton United on Monday.