Manchester United boss Sir Alex Ferguson hopes Nemanja Vidic's nightmare performance against Liverpool will be a one-off.

For United, the relief is Vidic will only serve a one-match ban as his previous sending-off at Anfield was for two yellow cards and does not bring an extra punishment.

"Nemanja has been unbelievably consistent for us this season," shrugged the United boss.

"But he is a human being. Players do have off days and he has made a mistake."