Acy, 31, is 6-foot-7 and last appeared in the NBA during the 2018-19 season, making 10 appearances with the Suns. He has spent time with the Nets, Mavericks, Kings, Knicks ad Raptors, appearing in 337 games overall.
Acy has also played in the G League, as well for Israeli power Maccabi Tel Aviv and the Shenzhen Leopards of the Chinese Basketball Association.
“The Reds, up to 5-2 in the ongoing EuroLeague Regular Season, were scanning the market for a roster upgrade, focusing on potential additions to the frontcourt,” EuroHoops’ Johnny Askounis wrote of Olympiacos. “The former NBA player, carrying European experience amplifying his defensive skills, is the big man coming in for head coach Giorgos Bartzokas.”