The midfielder rued the late chance to equalise 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 were heavy favourites 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.
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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."