Oliseh, who left the Super Eagles head coach position in February 2016 after falling out with several players and the Nigeria Football Federation hierarchy, has led Fortuna Sittard from the brink of relegation last season to the play-offs for top flight promotion this term.
But the club, who employed Oliseh in January 2017, insist Oliseh’s relationship with other personnel at the club left them with no choice but to let him go.
“Fortuna Sittard immediately relieve Sunday Oliseh of his duties,” the club announced on their official website on Wednesday.
“The club management makes this decision as a result of the repeatedly culpable actions for a long period by the trainer towards several persons in the organization.
“Several attempts by the club to move the trainer to other behavior remained unfortunately without result, resulting in an unworkable situation as a result.”
Fortuna Sittard have hit a slump under Oliseh, losing four straight league matches, but the club insist the losing had nothing to do with their decision.
“The board of Fortuna Sittard emphasizes that the decision to disband Sunday Oliseh is not motivated by the current sporting performance,” the club added.
“Because of his inadmissible actions, the coach has made the co-operation with many people within the organization impossible. From players to employees. Fortuna Sittard regrets the decision, but states that the club interest goes above all else.”