Eligible for the knockout stage are Spain, Portugal and Iran.
"We learned that we can play at a very high level".
The usually prolific Ronaldo was off target with a 53rd-minute penalty, awarded after a video-assisted review, as Portugal failed to build on Ricardo Quaresma's first-half stunner in the crucial Group B contest.
After a breathless 3-3 draw with Portugal in their opening game, La Roja laboured to a 1-0 victory over Iran, and require at least a point in Kaliningrad against a Morocco side playing for pride to guarantee a last 16 berth.
"The important thing is to think about the [round of 16] match, think about the game, get to know your adversaries and then to get well prepared mentally and physically, regardless of it being Uruguay or the hosts", Santos said of his team's progress. In the second match, Spain defeated Iran 1-0. The previous holder of the record for Portugal was Cristiano Ronaldo (33 years, 135 days), when he scored the victor against Morocco.
"I wasn't concerned", he added. "But now we need to be very demanding with ourselves and have clearly in mind that if we concede goals so easily, it will be very hard to reach our ultimate goal".
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If both Portugal and Spain win, the victor of the group comes down to goal differential.
"I'm going to repeat that our initial goal was to be at the top of the group and we've reached that goal. But despite the challenges we faced, we have emerged on top and we must look at that silver lining and think positively", Hierro told a news conference.
That hurts a lot, more to them than to the other players. "I tried to check with the referee, but the door was closed". "We had a big chance at the end of the game, we could have scored and won it".
Making his World Cup debut at the age of 34, Quaresma played a one-two with Adrien Silva to cut in from the right flank and curled the ball past the outstretched hands of goalkeeper Alireza Beiranvand with the outside of his boot.
Isco became Spain's 47th different goal scorer at World Cups, when the Real Madrid player equalised against Morocco.