U.S. star Christian Pulisic was taken to the hospital for scans on his abdomen after the team's win over Iran.

Pulisic sustained an injury after he slammed into Iranian goalkeeper Alireza Beiranvand while scoring the eventual game-winning goal late in the first half. Though he stayed down for several minutes and had to be helped to the sideline, he did return to the game.

The 24-year-old was substituted out at halftime. U.S. head coach Gregg Berhalter said immediately following the game he did not have an update on Pulisic's condition. The U.S.'s next game is Saturday.

President Joe Biden celebrated the U.S. win over Iran at the World Cup following remarks in Bay City, Michigan. He walked back up on stage and delivered his congratulations:

“USA! USA! That’s a big game, man. Well, I spoke to the coach and the players and said, ‘You can do it,'” Biden said.

He continued, “They did it. God love ‘em! Anyway, just thought you might want to hear.”

The U.S. will face the Netherlands at 10 a.m. on Saturday in the knockout round.

-ABC News' Ben Gittleson

The United States has advanced to the knockout stage of the World Cup with a 1-0 win over Iran.

Walker Zimmerman played hero for the U.S. in the 98th minute when he cleared a loose ball from just feet in front of their net.

The U.S. finished second in Group B and will face the Netherlands, the winner of Group A, in the knockout round.

England is ticketed for the knockout stage and the top spot in Group B after a 3-0 win against Wales.

Marcus Rashford had a brace with goals in the 50th and 68th minutes and Phil Foden added one in the middle, just one minute after Rashford's first goal.

England will face the second-place team in Group A, Senegal, in the first knockout match of the tournament.

U.S. national team coach Gregg Berhalter tried to keep the focus on Tuesday's game at a press conference as he faced questions about why the U.S. team's Twitter account removed the Islamic emblem from Iran's flag in a post Sunday. He also insisted his team had no knowledge of the post.

The U.S. soccer federation said it removed the logo to show support for those protesting in the country against authoritarian rule and its treatment of women.

Berhalter tried to keep the focus on the uniting power of sports and the World Cup, even as Iran called for the U.S. to be kicked out of the World Cup for altering its flag.

"Sport is something that should bring people together, bring countries together," Berhalter said. "When you look at the Olympics, to see all those countries competing at the same time, is a wonderful event. The World Cup is very similar, where people come from all around the world. Fans come from all around the world, and you get to compete on the field, as brothers, so sport does have the ability to do that."

U.S. captain Tyler Adams was criticized by an Iranian reporter for mispronouncing "Iran," which he apologized for, and he was questioned about discrimination in the U.S., saying it is everywhere but there has been progress. But he also deflected attention back to the game.

"Listen, we support Iran's people and Iran's team. But that being said, you know, we're laser focused on this match as they are as well," Adams, 23, told reporters. "We know how important this is for our progress of our team and what we want to do to prove to our country, you know, how hard we've been working. And we know they want to do exactly the same."

The U.S. must defeat Iran Tuesday to advance to the knockout stage of the tournament.

-ABC News' Karyn Rhodus