The Nigeria international joined the Turkish club permanently from Southampton last summer and enjoyed an outstanding 2025-26 campaign.
Onuachu finished the season as the league’s joint-top scorer with 22 goals, sharing the honour with Istanbul Basaksehir forward Eldor Shomurodov.
His impressive form has attracted interest from Saudi Pro League club Al-Ahli and a number of Bundesliga sides.
Reports claim Al-Ahli are prepared to offer the 31-year-old a salary worth three times his current earnings.
Although Trabzonspor are keen to keep the striker, Turkish outlet Dik Futbol stated the club could consider offers close to their €15 million asking price.
