The Chelsea midfielder rued the chance he missed after Hulk had pulled a goal back for Mano Menezes' team and felt that his country should have scored earlier in the match
Mano Menezes' team was the heavy favorite going into the final of the tournament against Mexico at Wembley but Oribe Peralta's double sent the underdogs on their way to a 2-1 victory.
The Blues' new signing was made to settle for silver and rued missing the chance that could have dramatically pulled the Selecao level after Hulk had grabbed a goal in injury time.
Oscar failed to hit the target with a close range header but also felt that Brazil had enough chances to level the score after Peralta's opener.
"It was a big chance at the end," Oscar told reporters. "It was not just the header, we had several other chances when the score was 1-0.
"I feel huge disappointment. I am very proud to have reached the final but we are so sad to not have achieved winning the gold medal."