Portugal are braced for tough battles in Group B but Bento remains confident.
"We have a very clear objective, first to get to the quarter-finals of this great competition which is Euro 2012, then, naturally, to try and go as far as possible," the coach told journalists.
"It would not be surprising to see the next European champions coming out of our group."
"We are taking Nelson who is a player with different characteristics from the other strikers, one whose path in the national team has been one of constant climb which earned him a place in his club," Bento said.
Oliveira emerged into the spotlight at the last under-20 World Cup where he scored four goals as Portugal reached the final. He has been dubbed Portugal's Eric Cantona and will dispute a place up-front with Zaragoza's Helder Postiga and Hugo Almeida of Besiktas.
"Nelson is a young man with great quality, potential and we will logically try to make him useful for us."
