In the hit drama's first season finale, the US marine - played by Damian Lewis - made a deal with terrorist Abu Nazir (Navid Negahban) to strike at America through political influence.
"Brody and Nazir made this sort of pact, that Brody would actually not be involved in any overt terrorist acts," Gansa told TVLine. "That's been a sort of détente between them."
The producer added that season two premiere 'The Smile' will see the uneasy alliance between the two men "begin to break down".
"That's exactly what the first episode brings into relief, that Brody's pitch to Abu Nazir may not have been enough," he explained.
Homeland star Lewis previously confirmed that Brody will be on an "accelerated political trajectory" in future episodes.
"Brody is clearly still vulnerable and unstable," he said. "He accepts the job [in politics] because it gets him to be closer to the man he needs to be closer to - the Vice President."
The series will return to Showtime in the US on September 30. Season two is expected to debut in the UK in October.
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Watch the latest promo for Homeland season two below:
Photo gallery - Homeland season 2: