Sven-Goran Eriksson has renewed his call for video technology to be introduced for contentious goal-line decisions and penalty calls.
Sunderland boss Roy Keane was livid Stephen Hunt's injury-time winner for Reading was allowed to stand at the Madejski Stadium on Saturday when it appeared the ball had not crossed the line before keeper Craig Gordon palmed it out.
"We are going to have a debate about technology every time something happens," he said.
"No-one can really say for certain whether the one Elano stopped on Saturday was in or not.
"The referee does not have a chance, you cannot tell from the bench and while the linesman might be able to if he was in line, he never would be if the shot was outside the box.
"It is a very difficult situation but as long as you don't have technology there will be errors because the pitch is too big and the football is too fast."