Fitch Ratings said on Tuesday the agreement to raise the borrowing capacity of the U.S. means the risk of a sovereign default is "extremely low" and commensurate with a AAA rating.

Fitch said in a statement: "(the) agreement was reached on an increase in the U.S.' debt ceiling and, commensurate with its 'AAA' rating."

The firm said it now expects to conclude its scheduled review of the U.S. sovereign rating by the end of August.

(Reporting by Daniel Bases, Pam Niimi and Chris Sanders; Editing by Andrew Hay)