Minnesota Vikings wide receiver Percy Harvin's status for Sunday's game against Miami is uncertain after he missed practice Thursday with a hip problem.

The team did not disclose details of the hip problem. Harvin, last year's NFL Offensive Rookie of the Year, has missed a lot of time since the start of training camp, mostly due to migraine headaches and a severe reaction to migraine medication that sent him to the hospital.

Cornerbacks Cedric Griffin and Chris Cook are closer to returning. They each missed the opener at New Orleans because of knee injuries. Defensive coordinator Leslie Frazier says Griffin and Cook will have a chance to play against Miami if they look sharp in Friday's practice.