Glick becomes chief commercial and operating officer at City in August.
The American told BBC Radio Derby: "It is very exciting. It's a chance to be working at the top end of global sport.
"But it's also bittersweet because I know what Derby County are about to do and, not only that, it's been an unbelievably positive journey for me."
Glick said his four-and-a-half-year spell with the Rams had been an "an unbelievably positive experience".