Lokossa topped the Nigeria Professional Football League goal scoring charts last term after scoring 25 goals in 21 matches.
He also played a crucial role to help Sai Masu Gida reach the final of the Nigeria Federation Cup where they bowed to cross-city rivals, Enugu Rangers on penalties.
At the Stade Olympique de Radès Tunis, the new signing would be hoping to help Moine Chaabani’s men win a fourth consecutive Tunisian elite division diadem.
In Africa, he is expected to lead the line in his side’s bid to defend their Champions League title.
Anice Badri’s last-gasp effort handed Esperance a 1-1 draw at Horoya, and they host Zimbabwe’s FC Platinum in their next outing on Friday.