Aviva could have its credit rating cut if its £3.7bn takeover of rival home and motor insurer Direct Line goes through.
AM Best said: ‘The ratings will remain under review until the group’s post-acquisition credit fundamentals are more clear.’
Aviva sealed the deal with Direct Line just before the Christmas Day deadline
Aviva has a financial strength score of A+ and an AA- credit rating, the second highest available from AM Best.
Specialist ratings agency AM Best said it had put Aviva’s long term credit and financial strength scores under review due to uncertainty over how the deal will affect its finances.