Four years ago, Ghana were the pride of Africa as they came within a whisker of becoming the first nation from the continent to reach the semi-finals, only for Uruguay to knock them out on penalties.
Much was expected of Kwesi Appiah's side heading to Brazil, however, only one point from a possible nine saw them finish bottom of Group G behind Germany, United States and Portugal.
Ghana's stay in South America was also overshadowed by rows over squad appearance fees, and needing a win in their final match against Portugal they were beaten 2-1.
"Admittedly, the performance of the team fell below the expectation of many Ghanaians," Nyantakyi told a news conference on Wednesday. "Our inability to qualify for the second round broke many Ghanaian hearts.
"We wish to offer our unqualified apologies for the disappointment."
The tournament in Brazil was Ghana's third consecutive appearance at a finals, and the first time they have failed to progress from the groups.
