The legendary left-footer missed last weekend's match against Perth with a groin injury, but is eager to get back on board this Sunday for one of the club's biggest matches of the season to date.
The news is a welcome boost to the Roar, who will look to overcome last week's hiccup against Perth which ended a five-match unbeaten run and cost the team a chance to close the gap on the top of the ladder.
Sydney sit in second place, trailing the Gold Coast on goal difference, but Tiatto said Brisbane were ready to prove their own title credentials against the Blues on Sunday.
"I think all the boys, after the performance last week, are ready to stand up and be counted," the former Socceroo said.
"Over the years we've had some pretty tight games against Sydney and I don't think this will be any different.
"(The Perth game) was a game we had to try a few things and it didn't quite work out for us, we just have to scratch that now and look forward to this week.
"Sydney are a decent side with a good bunch of players who play decent football."
The 36-year-old has had to fight his way through injuries this season, with a chronic back problem responsible for niggling injuries which have hampered an otherwise stellar season.
With the season still in its infancy, Tiatto said he would carefully manage his condition to get the most out of what is expected to be his final season of professional football.
"Over the years I've pushed myself pretty hard at training and been right for the weekend," he said.
"These days I have to manage things a bit better, I'm not 20 years old anymore, although I think I am sometimes.
"I'm sorting myself out and I'll be okay for the weekend."