Look for an announcement that Minnesota Vikings owner Zygi Wilf, who has pledged to pay $407 million of the cost of a proposed $1.1 billion stadium complex in Arden Hills, will increase his contribution to slightly more than $420 million.

Wilf hopes that will encourage Gov. Mark Dayton to call a special legislative session this fall to approve a stadium financing plan. Dayton is said to be aware of Wilf’s increased contribution.

The current Arden Hills proposal includes $350 million from Ramsey County and $300 million from the state of Minnesota.

– Although talks this week about a roof for the proposed stadium moved from retractable to fixed to reduce the cost, the Vikings would prefer a moving roof because Wilf wants to get a Major League Soccer franchise. None of the 18 MLS teams plays in a fixed-roof stadium.

Average attendance for MLS teams this year is 17,428. The Seattle Sounders lead the league, averaging 37,062 for 13 matches, followed by the Los Angeles Galaxy (23,051). The MLS plays an 18-game schedule.