Arnaiz has joined Leganes for an initial €5m this week.
"Back to Barça? I do not think about any of that now. I think only of Leganés. In recovering. In helping the team," he said.
"I wanted to come because, in truth, they were the ones who bet on me.
"I had made it clear. I also bet on them.
"Being close to home is also important. After five years away, away from the family, to come here I will be very good because I am one hour away. On free days I can escape to see my parents and my brothers."