CHICAGO – The unpredictability of concussions is nearly as worrisome as the injury itself.

They have drawn increased scrutiny in Major League Baseball, and for the first time since a new disabled list was implemented in 2011 for players suffering from concussions, the Sox are dealing with the uncertainty of head injuries. First baseman Paul Konerko landed on the seven-day DL Friday with a mild concussion, and the date of his return remains unclear.

All it took was a glancing blow to Konerko’s right temple. As Konerko made a play at first during the seventh inning Tuesday against the Royals, Jarrod Dyson’s elbow connected with his head. Although Konerko remained in the game, he did not play in Wednesday’s series finale.