My understanding of the rules is based, in part, on the BBC post-match summary. They seem to be of the opinion that FIFA can theoretically quash the one-match ban but are unlikely to do so (since that would effectively be the same as accepting an appeal against the second yellow card, which their own rules prohibit them from doing).
As John Motson pointed out, there is a precedent for a player being suspended (for 2 matches) for pretending to have been struck in the face by another player.
If you want to wade through the actual disciplinary code, see here:
http://www.fifa.com/m.../75/disco_2009_en.pdf
Chris