Ghana striker Junior Agogo says the 2-0 win over Morocco in their decisive Group A game has released the pressure on the Black Stars as the host nation.
Agogo says that the Black Stars are fired up for the quarter-finals
The victory means Ghana topped the group and they could face Ivory Coast, Mali or Nigeria in the last eight.
"There was a bit of pressure before, but now we're buzzing to be through," Agogo told BBC Sport.
"We hadn't played our best in our last two games, but we thought things would eventually come right for us."
Ghana beat Guinea 2-1 in their group opener thanks to a late Sulley Muntari strike and could only manage one goal against Namibia.
But goals from Muntari and Michael Essien against Morocco came courtesy of a change in tactics by Ghana coach Claude LeRoy.
"We decided that we were going to attack and attack," LeRoy said.
"We decided to make more room for Michael Essien to take charge and to come forward."
Morocco coach Henri Michel believes that the Atlas Lions must rebuild after their second-successive exit at the group stage.
"We now have to look ahead and build a new squad," said Michel.
We have learnt from our mistakes
Namibia captain Michael Pienaar
Guinea were the other team to progress from Group A, and after a 1-1 draw with Namibia they may well face Ivory Coast in the quarter finals.
"It's good to qualify for the quarter-finals, but our game was very poor today, we didn't play very well," said Guinea defender Bobo Balde.
"We'll have to do far better if we want to win in the quarter- finals, and we'll miss Pascal Feindouno."
Captain Feindouno will not play in the quarter-finals as he will be completing his two-match suspension after being sent off against Morocco.
Namibia captain Michael Pienaar was pleased with his team's showing at their second Nations Cup finals.
The Brave Warriors improved from a 5-1 loss to Morocco in their opening game and were then edged 1-0 by Ghana, before the draw with Guinea.
"We have learnt from our mistakes," said Pienaar.
"Now we need stability. We need to keep the team and the staff to look ahead."