Vikings spokesman Lester Bagley would not reveal the amount, but he said that the agreement would add about 3,000 temporary end-zone seats to the university's 50,000-seat stadium.
"We have close to 53,000 season-ticket owners, so we're trying to at least get to that," Bagley said.
It is not yet known how many games or even how many seasons the Vikings would play at TCF Stadium, so Bagley said the tentative agreement only covers the payments on a per-game basis.
The Vikings paid $1.7 million to play a game at the outdoor stadium in 2010 after the Metrodome's roof collapsed during a snow storm.
Representatives of Gov. Mark Dayton, Minneapolis Mayor R.T. Rybak and the Vikings said Friday that no agreement has been reached yet on a deal for a new stadium in Minneapolis.
The Vikings' Metrodome lease expired after last season, but they are expected to play at least one more season there.