The Turkish international went onto say that the tempo was so high that it almost made him throw up.
“In Turkey, the pre-season camps start with adapting to conditions, physical tests and light training. But it wasn’t like I expected here,” Ünal told Turkey’s FourFourTwo (via goal.com).
“In the first training session, the tempo was so high that I was about to throw up. I started to get used to it slowly and become more comfortable physically and mentally.”
Ünal joined City on a £2 million move over the summer transfer window but was loaned out to Belgium side Genk on a two-year deal.
Ünal has made three appearances for the Belgium top-tier side this season playing a total of 115 minutes.
Despite being 18-year-old Ünal already has an international cap for the senior Turkish national team and is currently on national duty with the U21 side.
Ünal is rated as one of the brightest prospects in Turkish football and currently holds the record as being the youngest player to have ever scored in the Super League aged just 16 against Galatasaray in 2013.