There was speculation when Adrian Peterson missed the Vikings' mandatory minicamp in June that the running back might be unhappy with his contract.

Former NFL executive Michel Lombardi, who now works for league's website and, has heard that Peterson definitely isn't pleased with his deal. Under the "Things I Hear" section of his new column, Lombardi writes that Peterson will be the next player to complain about his contract.

Peterson has three years left on the six-year, $40.5 million deal he signed after being the seventh-overall choice in the 2007 draft, but the reality is the final year (2012) of the deal is going to void. Thus, Peterson really has two years left.

Peterson has reached many of the incentives that he had in his contract and should make around $7 million in 2010. He will then make at the very least a little more than $10 million in 2011. However, there is a possibility his 2011 salary could reach an eye-popping $13 million with escalators.

The Vikings and Peterson's agent, Ben Dogra, have not been willing to comment on the situation to date but if what Lombardi is hearing from NFL insiders is correct that silence could soon end.