Manchester derby rivals Sergio Aguero and Marcos Rojo are at the centre of a bitter feud ahead of their meeting at the Etihad on Sunday afternoon, with details of a row that erupted at the World Cup emerging over the last 48 hours.
Aguero was left livid with his Argentine team-mate after Rojo brought the ex-husband of his current partner, Karina Tejeda, into their dressing room following a World Cup clash with Nigeria, with the damage of that decision still yet to be repaired.
The Manchester City striker squared up to Rojo that day and snubbed the olive branch of attending a scheduled coaching session with the Red Devils defender in Ardwick on Friday, stoking the fires ahead of the season's first clash between City and United later today.
Aguero accused of being a 'little scared'
Aguero put Man City chiefs in a difficult position by pulling out of that Premier League Kicks initiative at the last minute, with the excuse that he had to pick up family members from the airport.
Rojo was left to attend on his own and even took the opportunity to send a jibe in the direction of the absent Aguero.
Expect fireworks at the Etihad
The Mirror quotes Rojo as asking: "Where is Sergio? before adding, "Perhaps he is a little scared.”
That latest dig only serves to whet the appetite ahead of the season's first Manchester derby, particularly as Aguero and Rojo will come into direct contact from practically the first whistle at the Etihad.
It has to be said that Rojo has a very tough task on his hands to keep the free-scoring City striker quiet, with nine goals in as many Premier League games already this season.
Rojo could go a long way towards convincing United fans he has the quality to cement a starting spot at centre-back by nullifying Aguero though, and winning what has become a very personal battle between former friends in the process.