Having qualified for the quarterfinals, Brazil can capture Group C when it meets a New Zealand team that must win Wednesday's matchup at St. James' Park in Newcastle, England.
Brazil is one of two remaining teams in the tournament with perfect records along with Group D leader Japan.
Neymar set up two goals and scored one off a free kick in a 3-1 victory over Belarus on Sunday. That clinched a quarterfinal berth for Brazil, seeking to win Olympic gold for the first time.
"I'm glad that I was able to play well again and that I got the goal and the assists," Neymar said. "The victory was important to make sure we make it to the next round no matter what happens in the final match."
A draw Wednesday will be enough for Brazil to capture the group and it could still finish in first with a defeat. Brazil has six points, Belarus has three and New Zealand and Egypt each have one.
New Zealand must win Wednesday and get help in the simultaneous match between Belarus and Egypt in Glasgow, Scotland. It will advance if it wins and the other match ends in a draw, or a New Zealand victory coupled with an Egypt win by a lesser margin.
Upsetting the heavily favored Brazilians is the primary focus for now.
"The last match is such a prestigious game for our players to be a part of and we have to go into that believing we have a chance," coach Neil Emblen told New Zealand's official soccer website. "If we enjoy it, have the game of our lives and Brazil have an off day, then you never know."
Chris Wood scored for New Zealand in a 1-all draw with Egypt on Sunday. Both teams pressed for the victory in the closing minutes since the draw did not boost either's chances of advancing, and Egypt finished with a 28-4 advantage in shots.
"In the second half both teams were desperate for a win," Emblen said. "We had chances up to the last minute. I think we needed to win the game more than Egypt needed because now we are the ones who will face Brazil."
Brazil coach Mano Menezes has indicated that he could make changes for this final group game. Midfielder Ganso could be in the lineup after coming off the bench the first two contests.
Menezes was pleased with his team's performance Sunday, even though Brazil conceded the first goal in the eighth minute and didn't take the lead for good until Neymar scored in the 65th.
"We played with more intelligence in the second half, working the ball better to find the spaces we needed to find," Menezes said. "It was the first time this team was down in the score but it was able to overcome the deficit, that was important. A team that wants to be successful needs to go through these situations and respond accordingly, and we did."
