According to this Spanish website, Pau Gasol was injured while practicing with the Spanish team.
Pau hurt his finger when trying to block Felipe Reyes during today’s practice with the Spanish team. He was sent to a hospital in Seville for testing and X-rays in order to determine to extent of the injury.
It seems like a minor injury (and even if the x-rays are positive, it's just an injury on his hand), so hopefully, this will give him some time to rest (both he and Kobe have been playing basketball nonstop since 2007). We need a very healthy Pau Gasol if we want any shot at repeating next year.