USA began their campaign with a 2-1 draw over Ghana before being held in a 2-2 draw against Portugal.
“Everybody could see that we won against Ghana,” Johnson told FIFA.com. “Germany just got a draw.
“We caught up on Portugal, which nobody was expecting after the first goal.”
The American right-back feels his side are getting better by the game as they build cohesion in the camp.
I think you all can see we have grown together as a good group, good team,” he said. “We have a great team spirit. Everybody's winning for each other, just sacrificing themselves.”
USA’s final fixture against Germany is a special match for the Hoffenheim defender, who is born to a German mother and American father.
“It's not strange, I just feel excited,” Johnson said.
“I want those matches. I played against them in the Bundesliga, so it's not strange at all.
“I think we're just all excited to have this chance to play against Germany. I know a few players, I've played with them.”
He then heaped praise on his European opponents, who sit level with the Americans on top of Group G.
“I think everybody can see that Germany has a great team, great individual players,” said Johnson.
“I think they're technically good, they try to play straight to the goal.
“We have to defend as a whole unit again, like we did against Portugal, and we're going to create our chances.”
A draw would be enough to send the Stars and Stripes through, yet Johnson insists his side will look to take all three points.
“It's not in our nature," he said.
"We want to win this game, like we did in the qualifying match against Panama so that Mexico could go through.
“It's just not in our nature to play for a draw.”
Kick-off for the Germany-USA clash is at 6pm.