Houston Astros catcher Brian McCann's ailing knee will require surgery and keep him out for an extended period of time.
The Athletic's Ken Rosenthal reported Tuesday that McCann is expected to miss four-to-six weeks after undergoing a procedure on his right knee.
Rosenthal added that Max Stassi will become Houston's primary catcher. The team recalled Tim Federowicz from Triple-A to serve as the backup.
Knee injuries have been an ongoing problem for McCann since last season, and he landed on the 10-day disabled list in May with right knee soreness.