Fitch Ratings has expressed concerns about the use of certain financial tools. Total Return Swaps and repo transactions are being used as alternative financing methods, which could lead to risks. These risks include issues with transparency, liquidity, and creditor recovery.

Despite these potential risks, these tools can help governments diversify their funding sources. A specific example of this is Nigeria's $5 billion TRS, which has been highlighted by Fitch.

Further details about Fitch's concerns and the potential implications of these financial tools are available from the source, Nairametrics.