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DEN PRAIRIE, Minn. (AP) — Minnesota Vikings wide receiver Percy Harvin has missed practice again because of migraine headaches.

Coach Brad Childress confirmed Thursday that Harvin has been held out this week because of the condition. Harvin visited a doctor for the problem, which he has dealt with since college.

It first popped up this year in Week 3, forcing him to miss two practices. But Harvin played against San Francisco that Sunday and had his first kickoff return for a touchdown.

The Vikings have 13 players, including 12 starters, listed on this week's injury report with the Bengals coming to town Sunday. Running back Adrian Peterson (foot/ankle) and right tackle Phil Loadholt (shoulder) participated in part of practice Thursday after being held out Wednesday.

Safety Tyrell Johnson missed practice again because of a concussion.