Martinez has returned to the club this season and is currently backup for Bernd Leno.
He wrote for arsenal.com: "The reason I went out on loan last year is because I'd been training for six months but had only played two games. I went to Reading and was involved straight away. It was against Bolton on a Tuesday night and I felt as though I performed like I'd been playing week in, week out. I think that showed how professional I was.
"It was a challenge for me because I had the choice of Leeds or Reading. One of the teams was competing for promotion and the other was struggling at the time. I weighed it up and chose the harder option because I wanted to show to everyone what I could do and prove the haters wrong. Some fans were still reminding me about that 7-5 game... they forget that I was only 18 at the time. I wanted to go back there and prove that I could do it.
"In the last game of the season, the Reading fans were shouting my name and begging me to stay permanently. I can't tell you how good that felt, but that's how I want to feel all the time. I know how good I am and how good I can be."