Percy Harvin, who was hospitalized yesterday after collapsing at Vikings practice because of a severe migraine, is back at practice today.

Harvin was watching from the sidelines in shorts during the portion of practice that is open to the media at Winter Park.

The second-year wide receiver was rushed to the hospital yesterday after vomiting and fainting shortly after noon, causing the Vikings to cut their workout short.

UPDATE: The Vikings also had WR Javon Walker in for a tryout this morning, according to ESPN's Adam Schefter. Walker was cut by the Raiders in March.