Datcu most notable played for Dinamo Bucharest in Romania and Fenerbahçe in Turkey. He played between 1969-75 in Fenerbahçe squad a total of 220 matches. He won 2 Turkish Football League Championships. After his retirement as a player, Datcu become a coach and was active in Turkey. He discovered Turkish international goalkeeper, Rüştü Reçber whom he coached. During 2002, he worked with former Dinamo Bucharest teammate Mircea Lucescu, who appointed him as goalkeeping coach at Beşiktaş.
He also has Turkish citizenship since 1978 with the name 'İlyas Datça and is now living in Bodrum.