“Everybody seems surprised but I am not at all,” Hamzaoglu was quoted as saying by Fanatik.
Hamzaoglu also took a swipe at his critics who slammed him for targetting Niasse over the summer transfer window during his time as Galatasaray head coach.
“I guess those who actually understand from football agree that he is a very good player. We wanted him but it did not work out,” he added.
The former Galatasaray manager is credited with first spotting and developing the Senegal international during his time at Akhisar.
Hamzaoglu coach Niasse and under his stewardship the 25-year-old became one of the most sought after players in the Super League scoring 15 times and providing seven assists in 40 appearances.
Niasse was snapped up by Lokomotiv Moscow in the summer of 2014 for £4 million and scored 13 times in 23 games for the Russian side.
Everton then went onto sign the Senegal international on a £13.5 million deal making him the third most expensive signing in the Toffees history.