Staal underwent surgery during a second-round playoff series against Montreal to repair a sliced tendon in his right foot. He returned late in the series, but subsequently developed infections that required treatment for several months.
Staal couldn't work out or train due to the infections, and he missed all of training camp last month. He resumed skating this week, but the Penguins don't know when he can resume playing.
Staal, one of the NHL's best two-way forwards, still must regain strength in his right leg, which is weaker than his left, and go through training camp-like conditioning before he can practice.