The former Kumasi Asante Kotoko captain played an instrumental role alongside Nathan Sinkala and Gladson Awako in their friendly over the weekend
Adjei playing alongside Nathan Sinkala and compatriot Gladson Awako in the heart of midfield was very instrumental as the Ravens tamed the Lubumbashi-based club.
Coach Lamine N'diaye was so impressed with the output of the former Kotoko captain and has tipped him to play an instrumental part in his plans for the season.
Nii Adjei recently joined the Congolese Champions in a two-year deal for $150,000 from the Porcupine Warriors while Awako left Berekum Chelsea for $400,000 for five years. Both have had their International Transfer Certificates handed to Mazembe.