KSTP reports Griffen, 30, was confronted by Minneapolis police officers on Saturday, following an alarming incident at the Hotel Ivy in downtown Minneapolis.
The source said Griffen is "getting assistance on personal matters" and that the league is "comfortable he has a good support system around him".
After the Vikings requested a welfare check by Minnetrista police Saturday, Griffen was taken to a hospital and placed on a health and welfare hold, the end of a long day that started with Griffen being turned away from practice.
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.
The police said Griffen left the hotel on his own accord and no arrest was made.
The incident report further says that hotel staff believed Griffen was possibly under the influence of alcohol or narcotics and that Griffen had checked into the hotel last week; staff said he caused a disturbance "each time he walks through the lobby". Employees told police that despite his warnings of armed violence, Griffen did not display a gun.
The Minnetrista police report said members of the Vikings organization felt Griffen was acting out of anger and erratically.
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Ritch, who has blonde hair and blue eyes, was last seen wearing black shorts and an orange T-shirt that said "I am the man". Maddox often runs ahead of him but would usually slow down and stop to give him time to catch up, Ritch said.
A few minutes later, Griffen's wife again called police to tell them he was now in a vehicle with a man that Griffen didn't know. Coach Mike Zimmer said Griffen would not travel with the team to play the Los Angeles Rams on Thursday.
Reached by Kokesh on his phone, Griffen said he had no thoughts about harming himself or anyone else.
The Star-Tribune reports that Griffen's wife said her husband "awoke in the middle of the night on September 16 and left the home" and that Griffen does that "at times when he is fighting "demons" in his head". "We are friends with the Griffen family and we are here to support them in any way possible during these trying times", he said.
After that incident, Griffen allegedly tried to break into the home of Vikings teammate Trae Waynes.
Griffen then went to a nearby gas station, where he saw a man who works at an establishment he frequents.
Vikings general manager Rick Spielman said in a statement the team is aware of the incident and is focused on supporting Griffen, who has played for the team since it selected him in the fourth round of the 2010 NFL Draft.
After being told to leave practice, Griffen went to the Hotel Ivy, where he had been staying during the week after leaving his home. He signed a $58 million, four-year contract extension in 2017 and had a career-high 13 sacks that season.