Phil Jones left Old Trafford on crutches tonight to cast a shadow over Manchester United's 2-1 FA Cup win over Reading, and could put his participation in next week's Champions League second leg against Real Madrid in doubt.

"We'll have to assess it in the morning," said United manager Sir Alex Ferguson.

"It's an ankle injury obviously so I'd imagine he'll not be ready for Saturday anyway.

"But we'll see what he's like after that."

Match report: Man Utd 2-1 Reading

• FA Cup
• Man Utd