A radio station misinterpreted the reason why a news conference at the team base in Maceio was postponed on Tuesday, the Ghana Football Association said, denying players had refused to report for the conference.
Ghana's Joy FM said players - in particular Germany-based forward Kevin-Prince Boateng - were unhappy with Appiah's tactics in the defeat to the Americans in Natal. Boateng and AC Milan's Michael Essien started on the bench for the Group G game.
The GFA said the news conference was put back from the morning to the afternoon because the team only arrived back at its base from Natal at 3 a.M. Local time following Monday's loss. All 23 players also attended training later Tuesday, the GFA said.
The GFA also said captain Asamoah Gyan and team management had "confronted" a Joy FM journalist over the story.
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Cameroon's players initially refused to board a plane to Brazil over what they felt were poor bonuses and Nigeria's preparations have also been distracted by issues surrounding player payments.
Only one of the five African teams at the World Cup, Ivory Coast, won in the first round of games. Nigeria drew 0-0 with Iran and Cameroon, Ghana and Algeria all lost.
Ghana's task gets no easier. The 2010 quarterfinalist plays Germany next, which routed Portugal 4-0 in its opener.