Cape Town - Southampton's Dutch manager Ronald Koeman launched a surprise attack on former colleague and English Premiership rival, Louis van Gaal.
After masterminding his side's victory over Manchester United last month, Koeman has added further tension between the managers.
According to teamtalk.com, Koeman told Dutch television: "When you bring in Van Gaal you bring in quality but you also bring in someone who thinks he knows everything and that will cause clashes."