Hargreaves was back in first team contention after recovering from his recent knee injury, so this latest knock will come as a huge set-back.
It is believed Hargreaves picked up the injury when challenging for a header in training and falling awkwardly on his shoulder. He was immediately sent for X-rays to ascertain the extent of the damage.
The England international has been plagued by persistent long-term knee problems that have restricted him to just 39 appearances for United since joining the club in a £17 million transfer from Bayern Munich in 2007.
The 30-year-old’s latest injury, believed to be ligament damage to his shoulder, is likely to keep him sidelined for a further month.
Hargreaves has tasted just six minutes of first team action since September 2008 after recovering from two lots of knee surgery and a torn hamstring.

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Fresh Injury Blow For Man United’s Owen Hargreaves
