This is an incredibly lame excuse. There were guys out there playing in pain that would make most of us pass out. He had a bad game, end of story. Making up "the-dog-ate-my-homework" excuses just makes him look worse.
"It wasn't my fault. Honest! I ran out of gas. I had a flat tire. I didn't have enough money for cab fare. My tux didn't come back from the cleaners. An old friend came in from out of town. Someone stole my car! There was an earthquake! A terrible flood! Locusts! It wasn't my fault, I swear to God!"
We might note that it is not Donovan McNabb telling this story.