Vikings aren't sure when Harvin will return

   Explosive rookie wide receiver Percy Harvin sat out Minnesota’s victory over Cincinnati on Sunday as he continues to battle migraines, and the team isn’t sure if he’ll be ready to play next Sunday.

   “That’s a thing that none of us have a great feel for,” coach Brad Childress said. “They are so wide-ranging and people report different things. It’s different for different people. As coaches you want to put it in a box. ‘What is it? It’s a fractured femur. Well, how long is that?’ We will get up to speed as we go through next week and he will work as hard as anything.”