Manchester United's Luke Shaw will miss the start of the Premier League season and could be sidelined for four weeks after suffering a hamstring injury, the club said on the Wednesday.
The 19-year-old left back, who arrived at Old Trafford from Southampton in June for around 30 million pounds ($50.1 million), is yet to make his competitive debut for United.
Shaw, a member of England's World Cup squad who earned his third cap in the goalless draw against Costa Rica, missed United's final pre-season friendly against Valencia on Tuesday.
He faces a wait of up to a month to make his first start and new United manager Louis van Gaal has a selection headache following the departure of experienced left back Patrice Evra to Juventus.
United kick off the Premier League season against Swansea City at Old Trafford on Saturday.