Gernot Rohr said on Monday he felt "huge frustration" following his sacking as Nigeria coach weeks ahead of the delayed 2021 Africa Cup of Nations.
Rohr was dismissed on Sunday due to poor performances with the biennial African tournament in Cameroon between 9 January and 6 February.
"It's a huge frustration, but I don't want to argue, it's not my style," Rohr told AFP.
"(I'm) convinced that they will have a very good CAN because the team is in place and this very united group is ready for the challenges that await it."
German Rohr, Super Eagles coach since August 2016, had a contract with Nigeria until December 2022.
"I'm going to have a hard time doing without these great players and this very united staff, but the environment is not always favourable, we cannot control everything," Rohr said.
The 68-year-old led Nigeria to the 2018 World Cup and guided the team to third at the 2019 Africa Cup of Nations in Egypt.
Rohr has been replaced by former Super Eagles coach Augustine Eguavoen, who coached the team from 2005 to 2007 and on an interim basis in 2010.