The 21-year old Brazil international will move to London once his season with his current club is over but says he is anxious about the shift.
"There are lots of players who have moved to Europe but returned immediately as they couldn't adapt to their new countries," Sandro told the News of the World.
"I know I will suffer and I'm going to have some difficulties when I move to London, but I want to be prepared for that moment. I'm going to fight and stay in Europe.
"I don't want to be a six-week wonder and then return home, like many Brazilian and South American players do [after moving to Europe]. I want to make my career there and then return to Brazil - but only after I have achieved all my goals in Europe."