Midfielder Mika Baur has called on Celtic to show fight and bring the right energy and mentality when they host Rangers in the Premiership on Sunday after a bruising week of damaging defeats. Martin O'Neill's side compounded the 3-0 Premier Sports Cup loss to Rangers with another dismal showing, going down 3-1 at home to Ferencvaros in their opening Europa League fixture. Baur levelled against the Hungarians but Celtic immediately conceded a second in first-half stoppage time before Ferenvcaros netted again two minutes after the interval.