Marcos  Rojo's long-term future with Manchester United has been plunged into  doubt after he had a serious bust-up with Louis van Gaal.
The  Argentine defender, who cost £16million when he arrived at the club 12  months ago from Sporting Lisbon, has not figured in the squad once this  season as Van Gaal has preferred to use Daley Blind alongside Chris  Smalling.
He  enraged Van Gaal earlier this summer and was fined £140,000, which  amounts to two weeks' wages, after he failed to join up with United for  their pre-season tour of North America because of passport issues.
Tensions  between the pair have been building since then, with Van Gaal having  raised concerns about Rojo's fitness and it is understood the  25-year-old has clashed with his manager over the way he has been  treated.
It  now leaves Rojo, who played 60 minutes of a friendly against Ajax last  Thursday, in a difficult position, as Van Gaal would be open to the  prospect of him leaving on a deadline day.
When  United were discussing terms with Monaco over the deal for Antony  Martial, Rojo was initially put forward as being part of the deal.  Valencia also registered an interest before the Spanish deadline  closed. 



