JETS defender Antun Kovacic has spent the past week trialling in Korea, but Newcastle owner Con Constantine said his club would be paid "peanuts" if a deal was struck. Newcastle were approached recently by K-League club Ulsan Hyundai, who were interested in having a closer look at Kovacic with a view to signing him.Having recently recruited three experienced centre backs in Ljubo Milicevic, Nikolai Topor-Stanley and Angelo Costanzo, the Jets can afford to release Kovacic, who is contracted until the end of next season.Newcastle have reaped an estimated $1.5 million in transfer fees in the past few months after selling James Holland, Jade North and Mark Milligan to foreign clubs and loaning Joel Griffiths to Beijing Guoan.But Constantine said the likely transfer fee for 27-year-old Kovacic, who played seven A-League games for Newcastle last season, was "not worth talking about"."It's peanuts," Constantine said yesterday. "It's not a question of making money out of the boy. If he gets a start overseas, I would be more than happy for him."It's about giving him an opportunity. If it comes off, good luck to him."The Jets hope to hear from Ulsan within the next couple of days.Ulsan are one of Newcastle's Asian Champions League opponents, but Kovacic would not be able to play in the tournament because he is registered with the Jets. Newcastle signed Kovacic at the start of last season, but he was hardly seen early when van Egmond relied on North and Adam Griffiths as his central defenders.