Apparently Engram cracked a bone in his shoulder, he's out 6-8 weeks (which would be, what, between the first Rams game and the Giants game?). Danny O'Neil's blog post has more on it.
Optimistically, I guess this gives the youngins more of a shot to step up in the preseason. Better to have this now than right before Week 1...
He also posts on Tubbs -- apparently he failed a physical. His knee swelled up after some running.
Edit by John Morgan: There isn't much to add other than that Engram's injury was predictable. Not so much the specific type of injury but that Engram would suffer some kind of injury and miss significant time this season. I said it about 20 times in the offseason, and it wasn't a matter of prescience, just a sound examination of Engram's history, age, and style. 134 targets over the middle would punish Colossus. To my mind, this doesn't significantly affect Seattle's season. Engram was always underrated by most and overrated by some, and though I don't see one of Seattle's current receiving corps duplicating Engram's reliability, precision and toughness, I do think they can capably assume his slot duties and maybe add some speed and run after the catch.
Unfortunately, with Tubbs due just $830,000 this season, cutting him is probably purely because he's too far gone. I held out hope on Tubbs, thought he could recover from a procedure that's been demystified a bit in the past few years, but it sounds like no procedure will be enough to grant his knees the God given resilience to play in the NFL. Good luck Marcus.