Around 2,000 Aon employees working in the broker's managed solutions group face an uncertain future after the broker refused to rule out redundancies as part of its review of the business.
An Aon spokesman said this week it was too early to discuss what options were being considered in the review.
A final decision on the future of the managed solutions business will be made at the end of 2003.
"We are looking to see how in line our managed solutions business is with the rest of our core businesses," said the spokesman.
Parts of the business under review include: