Harewood was incensed that Agbonlahor chose to try to run down the clock rather than attempt to play him in behind the Everton defence in the closing seconds of the game.
O'Neill said: "I see it from Gabby's view because there are two minutes to go and we are 2-0 up. Why give the ball away?
"That's what we were taught years ago and if you do that you put yourself under pressure.
"I can understand the centre forward's thinking that he might be in with a chance of a goal but Gabby made the right decision and things are fine between them."