Queiroz said the match would be hard, given that Portugal is one of the title contenders, although he said that a lot of things could happen in the group as Spain takes on Morocco.
In Group B, Cristiano Ronaldo and Portugal will aim for a place in the last 16 against Iran, while Spain will do the same against already eliminated Morocco.
The second round of World Cup group fixtures has seen a number of sides through to the last 16, while for others, their race is effectively run. Wins for Germany and Sweden would mean three teams would finish with six points, sending it to tiebreakers.
If teams finish level on points, goal difference will be used to decide the final group placings.
Spain and Portugal were the pre-tournament favourites to advance from Group B, if Iran is going to pull the upset, TSN soccer analyst Steven Caldwell thinks they'll have to come out of the defensive shell they used in their last game.
Argentina then take on Nigeria and Germany face South Korea later in the week, with Jorge Sampaoli and Joachim Low both knowing defeats would nearly certainly end their World Cup hopes in Russian Federation. The first 16 matches saw 38 matches while the second 16 produced 44 goals with two seven goal matches - Belgium beating Tunisia and England downing Panama in Group G the highest scoring games in the tournament.
Iran fan and IT consultant Mehdi Fayez arrived Monday morning after reading messages from supporters saying they needed to trouble Portugal to stand a better chance of winning the match. Nigeria captain John Obi Mikel has already warned Croatia to play their strongest side against Iceland.
"And in any case we don't have the choice, they play after us".
Kushner rips Abbas, says Mideast peace plan due 'soon'
Israel captured east Jerusalem from Jordan in the 1967 Middle East war and annexed it in a move not internationally recognised. The Jordanian prince then drove William to a technology-focused event for young people linked to the Crown Prince Foundation.
Russian Federation and Uruguay have both qualified.
Tite's men are through if they get at least a point against Serbia in Moscow on Wednesday.
Mexico take on Sweden on Thursday at 2am, while Germany meets South Korea.
The Atletico Madrid defender, who scored Uruguay's opening goal of the World Cup in the 1-0 win over Egypt, has been sidelined with a thigh injury.
If Mexico and South Korea win, the three bottom teams would be tied. The victor takes it. England are ahead on the disciplinary front with one fewer yellow card than Belgium.
For Colombia and Senegal to both qualify, Colombia would need to defeat Senegal by a lesser margin than already eliminated Poland would defeat Japan by.
England and Belgium are locked together at the top of the group, both guaranteed to progress.