The 4-1 defeat by Manchester City at Craven Cottage leaves Mark Hughes' men out of the bottom three only on goal difference.
However, a couple of wins could push the Cottagers right up the table.
"We need to forget the City game and do better against Birmingham on Saturday," Gera said.
"It's another very important match and hopefully we can beat them."I am confident because we have a good team spirit and fantastic support."