Manchester United could sign a left-back in January with Luke Shaw out long-term with a broken leg.

"Luke's rehabilitation is going well but the process can be very slow," Louis Van Gaal said. "I don't know if he will play again this season. The doctors won't take any risks with him, which is good.

"I was convinced Luke would have a very good season and because of that I didn't buy a second player for left-back. Maybe we have to buy a left-back in January."

Ashley Cole could be an option for United.