Liverpool defender Mamadou Sakho will be out for between three and four weeks with a hamstring injury. The France international will miss tonight’s Premier League match with Newcastle, the FA Cup semi-final with Aston Villa at Wembley on Sunday and league games against West Brom, Hull and QPR. Liverpool are hopeful he could be back for the trip to Chelsea on 10 May. Sakho limped out of the FA Cup quarter-final replay win over Blackburn last Wednesday, and scan results have now revealed the full extent of the injury.