Ruben Amorim’s outburst after Manchester United’s draw with Leeds pointed to tension behind the scenes.
Videos emerged of the 26-year-old toasting his success by singing Queen’s ‘We are the Champions and Neil Diamond’s ‘Sweet Caroline’.
Ireland and Scotland and hosts Australia and New Zealand were also drawn together.
Root looked serene throughout his knock of 72 not out while Brook was involved in a livelier contest on his way to 78no from 92 balls.