The Flyers announced Monday that Ristolainen is expected to miss approximately two weeks due to an upper-body injury.
Ristolainen returned to game action Saturday against the Ducks following a nine-game absence due to a hand injury. However, head coach Rick Tocchet said Monday that Ristolainen aggravated the issue, per Jordan Hall of NBC Sports Philadelphia, which will result in another multi-week absence. Ristolainen could return at some point in the first half of November, but the Flyers' blue line will get a boost before then as Cam York (upper body) has been practicing recently and appears to be trending toward a return.