Argentina captain Lionel Messi questioned Nigeria's team work after their 3-2 World Cup win.
The Barcelona star scored twice in the triumph.
"Nigeria wanted to play with great individuals, but we are a good Argentina side," Messi told FIFA.
"We go forward, we're an excellent side and a united one. Today we told each other that we needed to be more united, as we strikers have to help out more in midfield and defence.
"I scored two goals, but we need to work hard in order to improve even more. This is a rare World Cup with surprising results, so we must stay calm.
"Can we win it? We'll carry on dreaming."
