Add Patrick Willis to the list of 49ers getting off-season tune-ups. The 49ers' inside linebacker had recent surgery on his left thumb and is now in a cast, as recent photos from his Instagram account show and as a league source confirmed. Hand injuries have been Willis' Achilles' heel, so to speak. When he broke a bone in his right hand during a pass-rushing drill in July, it marked the fourth time since he was a junior at Ole Miss. He did not miss any games due to that or any of his hand injuries. However, he sat out two games early in the season because of a groin injury. It's not clear when the most recent injury occurred. Willis was not on the 49ers' injury report heading into last week's NFC Championship game.