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A bitter feud between Sergio Aguero and Marcos Rojo has erupted again on the eve of the Manchester derby.

The Argentina stars come face to face at the Etihad with not only three points at stake but an old score to settle.

The row, involving Aguero’s girlfriend, was the reason the in-form City striker pulled out of a kids’ coaching session alongside United defender Rojo on Friday in the East Manchester district of Ardwick as part of the Premier League Kicks initiative.

City officials were left red-faced when Aguero refused to attend at the last minute claiming he had to pick up family members from the airport.

“Where is Sergio? asked Rojo, before adding: “Perhaps he is a little scared.”

Read more: Marcos Rojo says he'll 'firmly' deal with Sergio Aguero in the Manchester derby

(Image: Eamonn & James Clarke)

The pair became embroiled in a blazing row during the World Cup when Rojo invited the ex-husband of Aguero’s girlfriend, Karina Tejeda, into Argentina’s dressing room to celebrate the win over Nigeria.

Aguero started dating Karina after his marriage to Diego Maradona’s daughter, Giannina, broke down two years ago.

Sergio Aguero's Manchester City record 140 Apps 92 Goals Up to November 29

But he flew into a rage with Rojo when his girlfriend’s former husband - another Argentine pop star called Ezequiel “el Polaco” Cwirkaluk - appeared in the dressing room after the victory in Port Alegre.

Manchester derbies through the years:

Aguero had to be dragged away from Cwirkaluk by team-mates before angrily squaring up to Rojo.

And the hostility between the City striker and United’s new £16million centre-back became such a concern that Argentine officials were forced to step in to restore the peace.

Rojo said he would mark Aguero in the match “with a degree of firmness.”