John Stones was a surprise starter in England's 4-2 win over Croatia, but his performance raised concerns about his fitness.
What happened?
England boss Thomas Tuchel attributed Stones' struggles to the hot and humid conditions in Dallas.
The game was intense, with England coming from behind to win 4-2.
Stones and his defensive partner Ezri Konsa were exposed at times, sparking concerns about their partnership.
Why it matters for John Stones
Stones' lack of game time at Manchester City may have caught up with him, as he looked off the pace against Croatia.
Marc Guehi, who replaced Stones at Manchester City, is now waiting in the wings to start for England.
Guehi's quality was on display despite only being used as a late substitute.
What comes next?
England face Ghana on Tuesday, and it remains to be seen whether Stones will keep his place in the starting lineup.
Tuchel is known for keeping his cards close to his chest, so Stones and Guehi will have to wait and see.
Declan Rice and Harry Kane are expected to be fit despite picking up injuries in the win over Croatia.
The England squad will be looking to build on their win over Croatia and make a strong start to the World Cup.
Stones will be hoping to improve his performance and secure his place in the team.
The World Cup is a high-pressure tournament, and England will need all their players to be at their best.
Tuchel's tactics will be crucial in determining England's success, and he will be looking to get the best out of his players.
The match against Ghana will be a tough test for England, but they will be confident of getting a positive result.
Stones and the rest of the England squad will be looking to make a statement and prove their worth on the biggest stage.
The World Cup is a chance for players to make a name for themselves, and Stones will be looking to seize the opportunity.