Jon Bon Jovi has promised to retain the Buffalo Bills' ''passion'' if he successfully buys the NFL side.

The 'Always' rocker has penned an open letter to fans in a bid to reassure them about their concerns over his desire to purchase the football team - which is for sale after owner Ralph Wilson died in March - insisting his ownership group's main objective is to ''make the Bills successful in Buffalo.''

In the letter, which was titled ''Why We're Bidding on the Buffalo Bills'' and published in the Buffalo News, he wrote: ''There has been a lot of conjecture, so we think it's important to clarify our intentions to the fans of the team and people of Buffalo.

''I know how much the Bills mean to the people of this region. So I want you to hear this from me: I'm not risking it all to let you down. If we are given the chance to be the next owners of the Buffalo Bills, I promise you that we will bring the same passion that you do every Sunday, every day.''

The New Jersey-born rocker went on to describe his intention to ''carry on Ralph Wilson's legacy'' in Buffalo, and said he and his two Toronto-born partners are committed to working with local officials to identify a new stadium site in the region.

Bon Jovi's letter comes after weeks of speculation that the rocker will relocate the team to Toronto, and his statement has been cast in doubt by The Bills Fan Alliance, a group of fans and business leaders.

The organisation's directors said: ''While we appreciate his sentiment, it's worth noting that nowhere in his letter does he write or directly state that he will 'not move the Bills from Buffalo'.''