Cahill completed his first full training session for three weeks ahead of Chelsea's Champions League final and declared: "I will be fit."
Cahill and David Luiz both appeared to come through unscathed.
Cahill, who suffered his injury during last month's epic semi-final second leg at Barcelona, said: "I'm just happy that it's healed quickly.
"We've worked really hard, all day, afternoons, and I'm fortunate enough to be back.
"Hopefully, I'll be fit, I will be fit, and hopefully I'll be out there if selected."
He added: "First full session with the boys today after my injury, so nice to get back out there and get running around and kicking a ball about.
"There's some work to be done in two or three days now leading up to the game for me to get back into it.
"And if I need to do a little bit of other training, I'll do that.
"But, touch wood, there's no reaction from today and I felt fine out there."