Manchester United defender Phil Jones could be out of action for up to eight weeks with a knee injury, the English Premier League giants said on Saturday. The 20-year-old suffered the injury during training earlier this week and was sent for a scan which has confirmed he faces a long lay-off. A club spokesperson told United’s official website, ManUtd.com: “Phil Jones has had surgery on a knee meniscus tear sustained in training that will require six to eight weeks of rehabilitation.” It is yet more bad news for Jones, yet to make an appearance this season. After an lengthy break following Euro 2012, Jones suffered a back injury that prevented him playing any part in pre-season.