The speculation arose from comments made by head coach Sheldon Keefe, who described Matthews' mysterious injury/illness as lingering and worsening when he's on the ice. While Keefe didn't explicitly mention a concussion, Berger believes the team may be avoiding using the term.
Berger consulted a sports clinician for their opinion. The clinician noted that Matthews has a history of concussions in the NHL and suggested that the team's description of the issue, coupled with its effects being exacerbated by physical exertion, could indicate another head injury. However, the clinician acknowledged the uncertainty surrounding playoff disclosures.
Despite other theories like food poisoning or the flu, the clinician found them less likely given the symptoms described. Berger plans to await further updates during today's media availability ahead of the game.