Chelsea defender David Luiz says Oscar will get better once he adds some kilos to his frame.
Luiz admits his fellow Brazilian needs to get stronger to cope with European football.
Luiz said: "Oscar will be a huge success in Europe, that is for sure. Maybe he will need a few more kilos but, yes, he is going to be a big success.
"Every day he comes to my home because we have Brazilian food and he can speak the language with me.
"I try to help him because I know how hard it is to come to a country where you don't speak the language.
"I know a little bit about the city and there is Brazilian food in my home, so we joke and everyone is happy."