Manchester United legend Roy Keane feels David De Gea came up short in their FA Cup defeat at Liverpool.

Ex-United captain Keane said the 21-year-old, who joined the Reds for £18.5m in the summer, was at fault.

"De Gea looked a bit nervous," Keane told the Manchester Evening News. "When you have a nervous goalkeeper it can go through the whole team. He looked really nervous.

"He has to stick his chest out and say, I am number one today, I am going to produce a big performance.

"Goalkeeper is the most important position at Manchester United. That is why United got Edwin van der Sar at 34. United are missing that experience and presence.

"United will be kicking themselves. They have conceded shocking goals."