He made the announcement on X, formerly Twitter, confirming the end of his contract with the Nigeria Football Federation (NFF).
“Yesterday, we concluded our contract with the NFF. It was a pride and honour to coach the Super Eagles.
"It has been 22 months of immense dedication, sacrifice, emotion, and enormous enthusiasm. We feel a sense of fulfilment,” he wrote.
Peseiro took Nigeria to the Cup of Nations final for the first time since 2013 but they let slip a 1-0 lead against hosts Ivory Coast to go down 2-1 in Abidjan on February 11th.
The much-travelled coach has also managed Saudi Arabia and Venezuela.