Ghana coach, Kwesi Appiah believes his side’s biggest challenge would be how to unlock the German defence when the two sides clash on Saturday night in a Group G encounter at Brazil 2014.

Germany, one of the tournament favourites began their campaign on a good note after thrashing Portugal 4-0.

Meanwhile, Ghana are in dire need of a win against the three-time World Chmapions after the Black Stars suffered a 2-1 defeat to the USA in their opening group match.

But Appiah, in a pre-match conference at the Castelao Arena confessed it will be tough to penetrate his opponent’s defence.

"They have a really strong defence and it's not easy to penetrate it.

"Most of them have been together for a very long period. It's not going to be easy to penetrate, no matter who they put in their defence."

"We know the quality of the German defenders and we will see the quality of our strikers. It's going to be a tough one for both sides,” the former Ghana captain said.

Appiah went ahead to accentuate the importance of the game, since a defeat could just end Ghana’s campaign.

"We are the underdogs in this game. We're coming all out. "We want to do something great so we're going to fight as a team to get results."

"I actually don't believe in going out into a game and thinking let me go and get one point. Any game, my ambition is to go for a win."

Reports from the Black Stars camp say a few changes will be made to the team that lost the USA last Monday.