the prior game has little to do with the current situation as many examples of both players have been made clear since. Williams played v ajax and did well so it was natural he would get a chance.
he's also made serveral errors since and a number of those off long ball over the top.
Phillips has made different types of errors where he looks far more likely to pick up a yellow or look extremely nervy and can't pass very well at all.
Its a decision thats going to be made on training more than anything.