• European champions thought to have paid £25m• 21-year-old follows arrivals of Hazard and MarinChelsea have completed the signing of the Brazil midfielder Oscar from Internacional for fee thought to be £25m.The 21-year-old has been linked with the European champions for some time and he has previously said that joining Chelsea would be a "dream".Oscar, who is part of the Brazil squad that will compete at the Olympic Games, had already undergone a medical with the west London club.Chelsea have embarked on an overhaul of their attacking options, having already paid £32m to Lille for Eden Hazard and £7m to Werder Bremen for Marko Marin. The Bra...