The midfielder completed his move from Shakhtar Donetsk last week.
"I had a stable life in Ukraine. I had adapted and I was loved by the club. But I was left out of the national team in early 2012 and didn't get called up again. That really affected me.
"Then this chance to move to England came. I wanted to go as it will give me more visibility, both in Brazil and Europe. Now my chances of returning to the national team will certainly be a lot bigger."