Chelsea midfielder Oscar has suffered a training ground injury which has ruled him out of this summer’s Copa America in Chile, Brazil coach Dunga says. “Oscar got an injury in his last training session with Chelsea, we spoke with (Chelsea manager Jose) Mourinho and the doctor at Chelsea and his recuperation will take time and he won’t be at his best during the Copa America,” Dunga added. “After the Copa America we have the World Cup qualifiers, and we thought it best for him to be ready for the qualifiers.”