Aon will replace another insurer, AIG, on Manchester United's shirts

Manchester United has signed a four-year shirt sponsorship deal with the insurance giant Aon Corporation.

Aon will replace troubled US insurer AIG, which is restructuring itself having received a $150bn (£109bn) bail-out from the US government.

The new sponsor will appear on Manchester United's shirts from the start of the 2010/11 season.

Aon is based in Chicago and specialises in reinsurance, which is the selling of insurance to other insurers.

Neither Manchester United nor Aon has announced the terms of the deal or how much it is worth.

AIG paid £14m a year for its four-year deal, which ends in May 2010.

There have been reports that Aon's deal could be worth as much as £80m over four years.

Aon said it hoped that its relationship with Manchester United would help to improve its brand recognition.

It pointed out that after its first year sponsoring the team, AIG had become the 47th most recognised global brand and had jumped from number 84 to number 30 on Barron's list of most respected companies.