Ryerson limped off after 59 minutes of Norway's 2-1 extra-time defeat, watching helplessly from the sidelines as his country's tournament ended. The injury is suspected to be a recurrence of a thigh problem that had already forced him to miss two matches during the group stage, though no precise diagnosis has yet been given.
According to Bild, the outcome could have direct consequences for Dortmund's transfer business. The report states that Yan Couto's move to Como could be jeopardised should Ryerson's injury prove serious, with Borussia Dortmund reluctant to lose both right-backs at once.
Were Ryerson to be out for an extended period at the same time as Couto's departure goes through, Dortmund would be left without a recognised specialist in the position entirely.
Couto's move to the Italian Champions League club had appeared close to being finalised after a lengthy back-and-forth between the parties, with the 24-year-old Brazilian understood to be heading to Como on a loan deal including a €20m option to buy.
That arrangement now looks less certain, with Dortmund's final decision likely to depend on how quickly clarity emerges over the extent of Ryerson's injury in the coming days.
The 28-year-old's importance to Dortmund extends well beyond his defensive duties. He finished last season as the club's top creator with 18 assists in all competitions, 15 of them in the Bundesliga alone, a tally bettered by only two players in the entire division.
Losing him for any length of time would therefore represent a significant blow to Dortmund's attacking output as well as their defensive cover, particularly with Nico Schlotterbeck already sidelined for eight to ten weeks after suffering an ankle injury of his own during Germany's World Cup campaign.
Ryerson has also been linked with a move away from Dortmund this summer, with Sky Sports Germany reporting interest from Manchester United, adding a further layer of uncertainty to his situation as the club waits for a clearer diagnosis.