In 2006 at home, Klinsmann guided Germany to a third-place finish as coach, with assistant Joachim Loew, who is now Germany's coach. Berti Vogts, one of Klinsmann's staff, was the coach of Germany when it won its last title, the 1996 European Championship.
Loew and Klinsmann remain good friends, but Loew has said he would not be talking to Klinsmann during the tournament.
Klinsmann too has dismissed any collusion.
"I don't think that we are made for draws, really, except if it happens like tonight -- two late goals, last seconds," Klinsmann said after his team's 2-2 draw with Portugal, which scored deep into stoppage time. "I think both teams go into this game and they want to win the group."
"You're talking about a game (in Gijon) that is decades away that is only part of the Germany history and not the United States," Klinsmann said. "The United States is known to give everything they have in every single game. ... We have that fighting spirit. We have that energy and that determination to do well in every single game."
The German camp was equally indignant about any suggestions of a fix.
"It would be highly unsportsmanlike and unfair to other teams if anyone on the pitch had such thoughts," defender Mats Hummels said.
Assistant coach Hansi Flick said Germany "wanted to win the match and finish first in the group."
Germany and the United States both have four points, while Ghana and Portugal have one each. Both Germany and the U.S. could even afford to lose and still advance, depending on the outcome of the other match. Germany has an edge because of its superior goal difference (+4) over the Americans (+1).
Hummels said he was surprised by the quality of the U.S. team's play at the World Cup.
"They are playing a very good tournament. I did not expect them to be so strong. They beat us last year 4-3 (in a friendly) and clearly they are a good team," Hummels said.