With 12 minutes remaining and Chelsea trailing 2-0 from the first leg of the Capital One Cup semi-final, Hazard lost patience when a ball boy refused to hand over the ball after it had gone out of play.
Hazard attempted to kick the ball our from underneath him but appeared to make contact with the youngster, before referee Chris Foy produced a straight red card.
“Eden Hazard has been in to see the ball boy and the two have apologised to each other,” said the Chelsea interim boss.
“The ball boy knows he was wasting time. We are disappointed to lose the player but we cannot change things.
“They both recognise there was a mistake.
“The boy was apologising for time wasting. Hazard was frustrated and tried to get the ball. He was kicking the ball and getting the ball.
“We can analyse if for half an hour but we know that both are wrong.”