The Mets appear prepared to wait until rosters expand to activate Matsuzaka (elbow), ESPNNewYork.com reports. According to GM Sandy Alderson, Matsuzaka threw "pretty extensively" on Monday, enough to preclude the right-hander from having to make another rehab start for short-season Brooklyn on Thursday. However, it sounds like the Mets may still wait until next week to activate Matsuzaka, unless they're able to unload Bartolo Colon or another starter in the coming days.