Luke Shaw "has to improve" to get into Manchester United's starting line-up, but Jose Mourinho claims he is staying patient as the left-back returns from his latest injury lay-off. After shining for Southampton and playing for England at the World Cup, United made the full-back the most expensive teenager in history three years ago. Shaw has managed just 48 appearances for United since the move due to a mixture of form and fitness issues, most pertinently the double leg break that brought his second season at the club to an abrupt halt.