The agent for Jennings, Eugene Parker, told The Associated Press his client was visiting the Vikings. ESPN NFL Insider Adam Schefter had earlier reported the trip.
Jennings told ESPN's "NFL Live" on Tuesday that he was looking forward to the "experience" of free agency and would take his time picking a team.
"I want to experience it. I'm not one to jump the gun. I try to look at myself and believe I'm a pretty smart guy," Jennings told ESPN. "I want to weigh out all my options. I want to make sure I end up in a place where my family is going to be happy as well as myself and I can thrive."
Jennings has been Aaron Rodgers' favorite target the past few years. Before his injury-marred 2012 season, he had caught 67 or more passes in each of the previous four seasons, and gone over 1,000 yards receiving in all but one of those years. He finished with 949 yards in 2011 after missing three games with a knee injury.
Jennings, 29, finished last season with career lows in receptions (36), yards per catch (10.2) and total yards (366) after missing half the season with a torn muscle in his groin.
He led Green Bay with six catches and a score in the Packers' 45-31 loss to San Francisco in an NFC divisional playoff game.
He's in the top 10 in Packers franchise history in catches (425, seventh), yards receiving (6,537, seventh) and touchdown catches (53, fifth).
Information from The Associated Press was used in this report.