According to a team spokesman, Oklahoma City's first-year player is undergoing tests for a foot injury he may have sustained in a pro-am game.
"Chet is in the process of being evaluated, and when we have an update, we will communicate," the spokesman said.
In the CrawsOver Pro-Am event, the No. 2 overall pick in this year's NBA draft, suffered an injury while trying to defend against James.
James was one of the NBA players who participated in the pro-am.
In the second quarter, the game was canceled because of the court's condition. There were wet spots and condensation due to the humid day in Seattle.
At the Las Vegas Summer League, the 7-foot-1, 195-pound Holmgren averaged 14.0 points and 8.4 rebound in five games.