Giannis Antetokounmpo will pay for the construction of an indoor basketball court outside of Athens where at least 100 people died in a fire last year.
The fire destroyed over a thousand homes in the seaside resort of Mati.
"Antetokounmpo, the well-known Giannis Antetokounmpo, has made a donation at the site to build an indoor court -- I'm announcing this for the first time. It will be built with a modern method using a steel building frame so it can be ready by the end of the summer," said mayor Vangelis Bournous.
Antetokounmpo has previously taken part in campaigns to promote tourism and recycling in Greece.