Rangers signed winger Grezda this summer from NK Osijek.
Kuka told the Glasgow Evening Times that he believes the 23-year-old winger could be worth more than ten times what Gerrard and Rangers paid for his services in the future, if he lives up to his potential.
Albania international Grezda was one of 15 signings made by Gerrard this summer, joining towards the end of the window like Borna Barisic, Joe Worrall and Gareth McAuley.
Kuka said that he was surprised to learn that Rangers had landed Grezda for such a small fee of £1.8million (Scottish Sun) and reckons the club could sell Grezda for more than 10 times his original fee.
“Rangers have got an absolute bargain,” Kuka said. “I was surprised they were able to get him for such a low price. I think that is a real steal. In two years, I can see them selling him for £20million, because it's different when you buy from Croatia.
“I think he is going to be a future star of the national team. Technically, he is a great player. Teams of Rangers’ level everywhere in Europe would have been looking at him, because his potential is huge.
"I really see him as a very, very good player.”
Grezda is yet to make his debut for Rangers since joining the club, and has been ruled out of Monday's clash against Scotland for Albania with a long-standing ankle problem preventing him from featuring.
A six-time Albania international, Grezda suffered the injury in March and although he has played since for Osijek, the injury has continually hampered his progress.
It remains to be seen if Grezda will be included in the Rangers side to face Dundee on Saturday, as Gerrard looks to finally get his second league win of the season.
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