Griffen did not play in the Vikings' game against Buffalo on Sunday, and was not at practice on Monday.
According to police in Minnetrista, the Minneapolis suburb where he lives, Griffen was making comments about people trying to kill him.
On the way to the hospital, however, Griffen got out of the ambulance and police found him walking along County Road 44 waving his hands in the air.
Griffen told authorities "I'm leaving" after police arrived on the scene, according to Minneapolis Police Department Public Information Officer John Elder.
Officer Michael Kokesh met with Griffen's wife, who told him that Griffen got up in the middle of the night on September 16 and left the house, which he has done before in attempt to deal with "demons in his head", according to a police report.
A league source told ESPN's Josina Anderson that Griffen is "getting assistance on personal matters" and that the league is "comfortable he has a good support system around him". The police report and dispatch audio indicates he made the threat after staff didn't allow him to enter his room.
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Additionally, the report indicates members of the hotel staff thought Griffen could have been "under the influence of alcohol or narcotics" and that Griffen, who checked into the hotel last week, created issues/a disturbance "each time he walks through the lobby". Employees called the police when Griffen made threats and at one point laid on the floor. Within minutes, Griffen's wife notified police that he was in a pickup truck with someone who didn't know what to do with him. The driver took Griffen home after speaking with Tiffany, the police report said.
He told officials "he was in fear that someone was going to shoot him".
"We have a very, very good support program, and our owners do an unbelievable job of giving players all the resources that they need", Zimmer said. He was arrested twice as a rookie in 2011, once for public intoxication and soon after for allegedly assaulting a police officer during a traffic stop.
The Vikings released a statement saying, "We are aware of the situation involving Griffen Griffen and certainly concerned by what we have heard".
The Minnetrista Incident Report states there are no criminal charges forthcoming against Griffen since no crime was committed.
Griffen has played all nine of his seasons with the Vikings and signed a four-year extension last year.