The New York Giants suffered a massive blow to their hopes of repeating as Super Bowl champs, losing defensive end Osi Umenyiora for the entire season.

Osi Umenyiora suffered serious ligament damage in his left knee last night, and he will miss the entire 2008 season.

That was the terrible news that the MRI revealed this morning, according to his agent, Tony Agnone. The injury is a torn MCL, according to a source, though it’s not immediately known if the tear is full or partial. He will need surgery to repair the damage and the recovery time is expected to be 3-4 months.

Clearly that wasn’t what the Giants were expecting. After the game Saturday night, team doctors had told Tom Coughlin there was no ligament damage. But the MRI said otherwise. And while there was a possibility that Umenyiora could rehab the injury without undergoing surgery, that option was a little risky and a full recovery wasn’t guaranteed.

It’s not clear when the surgery will take place, but Umenyiora’s season is over.

Here’s a question: Will Michael Strahan come out of retirement to help the G-Men if asked? The man hated training camp and guess what? Training camp is over. The Giants would surely welcome the veteran sack master back with Umenyiora now done and the team hurting for depth. It’ll be interesting to see if Tom Coughlin reaches out to Strahan, or even if Strahan would want to come back after ending his career on top with a Super Bowl ring.

If Strahan isn’t an option, Mathias Kiwanuka will have to move from outside linebacker to end, which is the position he played in college. Either that, or journeyman Renaldo Wynn will likely get a start at end if the Giants want to keep Kiwanuka at LB.