The wide man injured a foot in the weekend loss to Turkey before Portugal flew out to their Ukrainian base camp at Lviv and Bento told reporters he was not sure if he would be fit.
"He had this injury before in the same place. He resumed training Thursday and we will assess him and only know tomorrow if he can play or not. He is our only doubt."
Friday saw Nani - who missed the 2010 FIFA World Cup™ because of injury - train normally with the squad although he sported a bandage.