The hit central defender’s ankle woe demands yet another change in an ever-changing back four.
But head coach Slavisa Jokanovic says he is buoyed by the massive travelling support making the two miles across west London. It's a 1,600 sell-out in the Brook Road Stand at Griffin Park, and the man in the dugout wants to make it a memorable last away day for fans.
"I know how important this derby is for our supporters," he said. "It's a chance to give them something & get into some positive habits.
We've promised so much but haven't given our supporters too much. Saturday is a chance to change that, but Michael Madl has an injury is likely to miss our final two games."
Joka admits another performance like the 3-1 defeat to Nottingham Forest last Saturday, and Whites will come away pointless from Griffin Park as well.
He said: "Brentford play very good football. I like how they play. If we play like we did against Forest we'll pay an expensive price."
"It will be a full stadium with many Fulham supporters. I'm fighting for this club and my players are in the same situation."