A dispute has emerged between the representatives and part-owners of the Manchester United target Marcos Rojo and his current club Sporting Lisbon.

The Argentina defender is currently the subject of disciplinary action by the Portuguese club after apparently refusing to train amid reports of a £16 million bid from United.

Management company Doyen Sports, which owns 75% of the player, has now hit back over Sporting’s stance and threatened legal action if fees due to it from any rejected bid are not paid. It is reported that Doyen is entitled to a payment from Sporting worth 75% of any declined offer for Rojo. In this instance that would equate to £12 million.

Doyen holds strong rights over the player after paying 75% of his transfer fee from Spartak Moscow in 2012.