The Percy Harvin situation continues to grow more odd by the day.

The Vikings received a roster exemption for Harvin on Thursday and as part of the process sent the wide receiver what is known as a five-day letter. Harvin hasn't been with the team since July 31 when he left Mankato after the death of his grandmother. The purpose of the letter is to warn a player that in five days the team has the right to place him on the reserve/left the squad list. If Harvin was put on that list -- the Vikings are NOT obligated to place him on it after five days -- he would not be able to play again this season. Vikings coach Brad Childress explained in a text message Friday that in order to get the exemption the five-day letter had to be sent. Childress also reiterated, as he has throughout this process, that the team is being "supportive" of Harvin. Nonetheless, the fact the Vikings had to take this step indicates Harvin might not be back anytime soon. Childress said this week that Harvin's absence had continued because last season's NFL offensive roookie of the year was again dealing with migraine headaches. Harvin has been at his home in the Twin Cities. Harvin had migraine headaches on several occasions last season and even missed one game. None of his migraines lasted long enough to keep him away from the team for the amount of time he has been missing in recent weeks. As he did Friday, Childress has attempted to show patience with Harvin in his comments and admitted he has no idea when the second-year player will return. Harvin's agent, Joel Segal, has declined to comment. The Vikings will open the preseason on Saturday night in St. Louis and clearly Harvin won't be with the team. The Vikings did not make an immediate roster move to replace Harvin.