Manchester United have confirmed they will team up with Aon from the start of the 2010-11 season. The giant American company's brand name will feature on the club shirt for four years.
No terms of the sponsorship deal have been announced but the deal is thought to be worth about £80 million.
United chief executive David Gill said: "We are delighted to be entering such an important relationship with a company of the stature of Aon and to have its logo adorn our shirts from the start of the 2010-11 season."
The Barclays Premier League champions described the bond with Aon as "a significant global partnership and principal sponsorship agreement".
Aon are the world's leading risk advisor and human capital consultant and Gill added: "Today's announcement clearly strengthens our position as one of the biggest clubs in world football.
"We look forward to being closely aligned with the world leader in risk management, a firm which shares our values and is an exciting partner for Manchester United."
Greg Case, Aon's president and chief executive officer, said: "It is a unique opportunity when two leaders in their respective fields can come together in a partnership such as the one we are announcing.
"Manchester United has one of the most recognised sports brands in the world. David and his team are all about winning and about excellence; the same holds true for the Aon team.
"While we are delighted that our brand will be showcased to the over 330million fans of Manchester United as well as the countless followers of football worldwide, we also are extremely excited about the opportunity to maximise the value of this partnership globally."
BIGGEST SHIRT DEALS
Manchester United's £80m shirt deal outstrips the sponsorship packages agreed by their Premier League and European rivals.
Bayern Munich - £17m-a-year, four-year deal with telecommunications company T-Home.
Real Madrid - £15m-a-year, four-year deal with Austrian gambling company Bwin.com.
Juventus - £15m-a-year, five-year deal with Libya-based oil company Tamoil.
Chelsea - £10m-a-year, five-year deal with Korean electronics giant Samsung.
Liverpool - £8m-a-year, four-year deal with Carlsberg.
Manchester City - £8m-a-year, three-year deal with Etihad Airways.
Barcelona - European champions donate £1.5m-a-year to Unicef in order to wear the charity's logo.