Captain Andy Robertson came off early during Scotland's first training session in Germany ahead of Friday's Euro 2024 opener against the host country in Munich.
Steve Clarke's men took part in an open training session in the Stadion am Groben in Garmisch-Partenkirchen where hundreds of locals turned up in the rain to see Scotland being put through their paces.
However, there was some concern when Liverpool left back Robertson had to go off and Hearts striker Lawrence Shankland did not take part in the full session either.
Physios raced onto the training field to attend to the skipper, who could become the latest and most serious injury concern for Clarke ahead of the tournament.
The Scottish FA have reportedly played down the incident, insisting that it was a purely precautionary move, however.
Midfielder Stuart Armstrong returned to training after recovering from a muscle injury and went through an individual programme.
Clarke is already without the services of Lyndon Dykes, Ben Doak, Lewis Ferguson, Aaron Hickey, Nathan Patterson and Jacob Brown.
Scotland kickstart the tournament alongside hosts Germany on Friday, officially getting the ball rolling for the highly-anticipated summer competition.
They will then face trips to Cologne to take on Switzerland on June 19, before a June 23 meeting with Hungary in Stuttgart.
Clarke's No 2 John Carver is set to face the media at 12.30pm.