Paul Pierce talked to CSN Philly about playing overseas:

"As far as retiring from the NBA, I think I will be done after this contract because eventually I want to go overseas and play and live for a couple of years. That's why this is a big contract for me, knowing I'm going to retire a Boston Celtic. I want to go to either Italy or Greece for a year. I think I want to be able to bring my family over to just kind of share a different experience overseas for a couple of years, before I settle into retirement."

Via Ball Don't Lie