Samson Siasia has quit Nigerian football after leading the Super Eagles to bronze at the Olympic Games, blaming a "disrespectful system," among a number of other problems.
Siasia, who also won a silver medal at the Beijing Games in 2008, said his decision was affected by unpaid wages and a lack of appreciation for his work.
"I have reached that point where I have to say I have had enough," Siasia, whose contract expired at the end of the tournament in Brazil, told the BBC.
"I've gone several months without getting paid, years of being derided and disrespected by the sports authorities in Nigeria but I am done already.
"It's sad that after all we went through to get to Brazil and end up winning a bronze medal, the players, coaching and backroom staff never received a 'thank you' in appreciation despite a turbulent time at the Olympics."
Payment issues for their flight meant Nigeria were held up in Atlanta, and only landed in Brazil hours before their opening 5-4 win over Japan.
During the tournament, players boycotted a training session in the build-up to their quarterfinal against Denmark in a dispute over pay, while midfielder John Obi Mikel also settled part of the team's hotel bills and was subsequently reimbursed by Nigeria's sports ministry.
Nonetheless, the team clinched the country's only medal at the Rio games.
"First we had the minister deride us for camping in Atlanta and even denied our existence as a group before the flight problems," Siasia said.
"Players had to embark on a strike to be heard, then the boys kept a good spirit to win an incredible medal, only to be publicly criticised for speaking to the Japanese surgeon who supported and rewarded the team for their brave spirit.
"I've taken a deep look at everything and concluded that things need to change for us to progress as a country not just in football but our general lives.
"I have fulfilled my obligations as a citizen, footballer and coach; right now I do not want to be involved in the Nigerian football system anymore."
NFF vice president Seyi Akinwunmi said of Siasia's decision: "Truth is that he has done well for Nigeria in difficult circumstances. Even though we all work in difficult circumstances, we should give him kudos and acknowledge the feat.
"However, it is his prerogative to quit if and when he decides to. Personally I wish him well and thank him for the smile he brought to our faces during the Olympics."