Vikings head coach Brad Childress said WR-KR Percy Harvin was not at the team's Winter Park, Minn., facility as he is dealing with another bout of migraine headaches.
Harvin's status for Sunday's game against the Bears is unknown.
Migraines have been a problem for Harvin, who missed practice time in each of his first two seasons because of them. He visited with doctors Wednesday.
In addition, Harvin has battled through an ankle injury, which he suffered against the Patriots in Week Eight. That said, Harvin had career highs in Sunday's win with nine receptions and 126 yards.
This season has been a trying one for the receiver, who had an argument with Childress last week, reportedly over his ankle. Childress said he wanted Harvin to get an MRI, but Harvin said he wanted to practice and not get the procedure done. Harvin also has said he was upset by the Randy Moss trade, as the two players had become close quickly.