Declan Rice suffered an injury scare in England's 0-0 draw with Ghana, leaving him with a strapped left calf after a strong challenge.
The incident occurred near the corner flag during the second half, but Rice was able to finish the match.
What happened?
England's medical staff will monitor Rice's fitness, along with Djed Spence, who picked up an ankle knock.
Spence limped heavily after being subbed off on 66 minutes, having nullified a danger from Marvin Senaya.
Rice spoke to BBC Sport, downplaying the concern and focusing on the upcoming match against Panama.
Why it matters for Declan Rice
The Arsenal midfielder emphasized the difficulty of playing against a compact Ghana side, with 11 players behind the ball.
He acknowledged the need to find solutions and create more with the ball, but remained positive about England's chances.
What comes next?
Rice and Spence will be assessed at England's Kansas City training base ahead of Saturday's final Group L showdown.
England can still top the group with a positive result against Panama, according to Rice, who insists there is no need to overreact.
The 0-0 draw was a sobering follow-up to England's impressive 4-2 triumph over Croatia in their World Cup opener.
Rice's optimism is rooted in the fact that many top nations have drawn their first game, and England can still achieve their goal.
The England squad will look to bounce back against Panama, with Rice and Spence's fitness being closely monitored.
And the versatile full-back Spence will be hoping to recover in time to feature in the crucial match.
But for now, the focus is on the fitness of Rice and Spence, as England prepare for their final group stage match.
So the England medical staff will have their work cut out to get the players ready for the Panama match.
Rice's left calf injury will be a concern, but he is expected to be fit for the match, according to initial reports.
The England squad will be looking to Rice to lead by example and help the team secure a positive result against Panama.