Scott McTominay has recovered from a stomach issue and returned to training with the Scotland squad.
The midfielder missed team training on Thursday, sparking concerns among fans.
What happened?
Scott McTominay travelled separately to the team hotel in Boston as a precaution to avoid passing on his illness.
He was watched closely by a team doctor and has since recovered.
The 29-year-old is one of Scotland's standout stars, scoring 15 goals and assisting three times in 70 appearances.
Why it matters for Scott McTominay
Manager Steve Clarke downplayed the panic surrounding McTominay's illness, insisting the entire team are ready for their clash with Haiti.
Clarke said: "I've got 26 superstars here, to try to put so much on to one person is not fair."
What comes next?
Scotland will face Haiti at the Boston Stadium at 2am UK time, aiming to put points on the board in their first World Cup appearance since 1998.
Defender Scott McKenna is the only confirmed absentee versus Haiti, sidelined with a calf issue.
McKenna is expected to return to training on Monday.
The Scotland squad are preparing for a tough match against Haiti, with McTominay's return to training a welcome boost.
And the team are confident of getting a positive result, with Clarke emphasizing the importance of teamwork.
But McTominay's individual skills will be crucial in the match, having scored an incredible overhead kick in the team's 4-2 win over Denmark.
So the Scotland squad will be looking to McTominay to bring his A-game to the match against Haiti.
The match against Haiti will be a tough test for the Scotland squad, but with McTominay back in training, they are feeling positive.
As the team prepare to take on Haiti, they will be looking to get off to a strong start in the World Cup.
With McTominay's return to training, the Scotland squad are feeling confident ahead of their match against Haiti.
The team will be looking to build on their recent success, including their win over Denmark, which sent them to the World Cup for the first time in 28 years.