Dykes' leg injury is now being assessed by the Scotland medical team two weeks before Steve Clarke's side begin their Euro 2024 campaign against hosts Germany.
More immediately it cast a shadow over the 28-year-old's involvement in Monday's friendly against Gibraltar.
Images emerged on social media of Dykes, who plays for English second-tier club Queens Park Rangers, on the ground with an apparent knee injury before he left the field on a stretcher.
The photographs were taken by a member of the public looking down into Glasgow's City Stadium, formerly known as Lesser Hampden, which sits immediately beside Hampden Park - Scotland's national stadium.
Dykes has scored nine goals across 36 internationals and featured in all eight of Scotland's qualifiers, scoring once.