Many years ago I saw Sekunda on NBC with some European team playing an NBA team in an exhibition. The McDonalds Classic or something like that. Had to be a pretty good Euro team, even if it wasn't EuroLeague.
Just looked it up, He played in the 97-98 EuroLeague with Benetton and 99-00 with the Varese Roosters. DeRon Hayes also played in the 99-00 EuroLeague with Cholet.
John Amaechi played in 96-97 with Panathinaikos and 97-98 with Bologna.
The site I used only had the EuroLeagues that FIBA ran. It looks like EuroLeague broke off from FIBA in 01 when there were two leagues, one by FIBA (SuproLeague) and the now independent EuroLeague.
Glenn Sekunda in FIBA Europe Competitions
DeRon Hayes in FIBA Europe Competitions
John Amaechi in FIBA Europe Competitions
Pete Lisicky in FIBA Europe Competitions
Jan Jagla in FIBA Europe Competitions