"Following an alleged incident involving the 4th official, the match was temporarily suspended. After consultation with both teams, it was agreed that the match would restart with a different 4th official," UEFA said in a statement.
"UEFA will thoroughly investigate the matter and further communication will be made in due course."
During the interruption, Basaksehir posted a message on Twitter against a UEFA backdrop with the message "NO TO RACISM."
Seven years ago, Hategan was in charge of a match between CSKA Moscow and Manchester City when City's black players were racially abused.
City captain Yaya Toure directed referee Hategan toward fans making monkey noises at the English club's black players.
Michel Platini, UEFA's president at the time, requested an internal inquiry involving the referee to examine why guidelines were not followed to respond to discrimination incidents during matches.
- AP