The 34-year-old point guard is on blood-thinners. A league source told The Athletic that there is optimism he will return this season.

Here's everything you wanted to know about a deep vein thrombosis, the diagnosis sidelining Bucks guard Damian Lillard indefinitely.

Deep vein thrombosis is an abnormal clot within a vessel where the congealing of blood blocks the flow through on the way back to the heart. It is most common in legs but also can happen in the arms,