Sir Alex Ferguson said referees should not be responsible for calculating the amount of time to add on after watching Aston Villa beat Manchester United.
Ferguson argued his case vociferously with fourth official Michael Jones at Old Trafford after three minutes of extra time had been signalled.
He said afterwards: "It has to be taken out of the referee's hands.
"There were two stoppages of two minutes three seconds, but we only played three minutes added time."
Ferguson argued his case vociferously with fourth official Michael Jones at Old Trafford after three minutes of extra time had been signalled.
He said afterwards: "It has to be taken out of the referee's hands.
"There were two stoppages of two minutes three seconds, but we only played three minutes added time."