"Once again, just when we have the chance to build our castle up, we have allowed someone to knock it down," said Keegan.
"We need to look at our defending at set-pieces again, we are all right until somebody comes into the box we don't expect to be there."
"Perfect weeks are very seldom in football and this is not the end we would have wanted," he added.
"It is not the end of the world but it is a disappointing end to a good week."
West Brom match report