The dynamic youngster spent the second half of last season on loan at the MKM Stadium and impressed enough for the Tigers to buy him permanently from the Turkish champions earlier this summer.
Allahyar penned a four-year contract with the Tigers after the club agreed a double deal worth in the region of £7m for him and Turkish international Ozan Tufan.
“No, it was not difficult,” he told Hull Live. “It’s a really good, tough league. It has great quality and it’s very quick, which is good. I like that mode of football, and we’ll see what happens this season. I’m really happy to be here, I believe we have a great team and this season we have a big goal (promotion).
“We’ll start the new season with one hundred percent focus and get the best place (in the league standings) that we can,” he added.