
The tactician took over at AmaZayoni in 2013 and managed to lead the club to a respectable seventh-placed finish in the Premiership last season.
However, Aces have since suffered a major dip in form and find themselves 13th in the top-flight standings, just one point clear of the relegation zone with eight games remaining this season.
The club have since taken the decision to relieve Barker of his duties, although his replacement is yet to be confirmed.