But Florent Malouda was described as by caretaker manager Roberto Di Matteo as "touch and go" for the Allianz Arena showdown.
Di Matteo said on Sunday that Luiz and Cahill's fight to be fit would "probably" go right up to the day of the game, so their attempt to train on Tuesday was a huge boost for the Blues.
"Gary and David are going to try to train with us today [Tuesday]," Di Matteo said of the centre-back pairing, who have both been out for around a month with hamstring injuries.
Malouda failed to complete the first half of Chelsea's final Barclays Premier League game of the season against Blackburn on Sunday having strained a hamstring.
Di Matteo said: "Flo, we'll still assess and it's going to be touch and go for him to be available for Saturday."
With John Terry, Branislav Ivanovic, Ramires and Raul Meireles suspended, if Luiz, Cahill and Malouda were not fit for Saturday's game, Di Matteo admitted he would be forced to complete his bench with youngsters.
"That's the worse-case scenario," he said.
"We will take some reserve-team players onto the bench, into the squad, and just figure out what to do.
"I've been trying different options in training and different solutions just in case."
Saturday's game could be Di Matteo's last in charge, with the Italian claiming on Sunday he had "no problem" if winning the Champions League failed to convince Chelsea to appoint him full-time.
There will be no shortage of suitors for his services after he picked up the pieces of the doomed Andre Villas-Boas reign to lead the Blues to the final - as well as an FA Cup triumph.
There are currently vacancies at Aston Villa and West Brom, who sacked Di Matteo just over a year ago.
Asked if he would ever go back to the Hawthorns, he said: "In my life, I've gone back to an ex-girlfriend and it didn't work out.
"I'm not sure whether it's the right move."
Luiz and Cahill both took a full part in training this afternoon and appeared to come through unscathed.