The power forward underwent a knee procedure in May to relieve tendinitis in both joints.
The 33-year-old told the team's website: "I feel better, getting better, getting a better rhythm and better touch. My legs are feeling better. So far, so good, five days into camp and [I feel] positive.
"I thought I would be a little more limited. I basically started running on the court three weeks ago. Up until this point, I hadn't done any basketball stuff with other players or with contact. So far, it's been good. The doctors are really encouraged that everything looks good.
"For sure, for sure, I'm rusty. I still have to get a good feel for the ball and for the game. But everyday, I pick it up and improve, so I'm very excited about my progression."
Gasol has a career average of 18.4 points per game.