RIO DE JANEIRO — The F.B.I. on Monday said it was seeking to interrogate an Egyptian man who arrived in Brazil last year, calling him a suspected operative for Al Qaeda who has been involved in planning attacks against the United States.

Hours after the bureau issued a notice seeking information about the man, Mohamed Ahmed Elsayed Ahmed Ibrahim, the Brazilian government said in a statement that it “stands ready to cooperate with authorities in the United States” in this case.

The statement also said Mr. Ibrahim, 42, had arrived in Brazil in 2018 and was living there lawfully. Neither government said where in the country Mr. Ibrahim had settled.