Despite enduring a disappointing spell with Leeds United earlier in his career, Ekuban has impressed since initially joining Trabzonspor on loan in 2018.
During his time in Turkey, the 26-year-old has contributed 12 goals from 48 appearances in all competitions, with almost half of his outings coming from the substitutes' bench.
According to Karar, Celtic and Rangers are now contemplating whether to launch a bid for the Ghana international during the next window.
However, the report adds that Ekuban is not actively looking to leave Trabzonspor, who are currently challenging for the league title.
Brighton & Hove Albion are also said to be monitoring the situation ahead of a possible approach for the attacker.