Celtic vs Raith Rovers live Watchalong league cup | celtic raith rovers live @nsports #celtic #raithrovers #leaguecup Depleted Celtic are in a "constant state of flux", says manager Ange Postecoglou, after captain Callum McGregor and winger Liel Abada were ruled out of Thursday's Europa League group opener against Real Betis. McGregor has a knock, while Israeli Abada is out for religious reasons. Anthony Ralston returns, but Kyogo Furuhashi and Greg Taylor are among Celtic's other absentees in Seville. "We're getting some significant outs," said Postecoglou. But it's kind of been the state of play since I got here. We've been in a constant state of flux and not been able to settle. "I see that as an opportunity for us to build resilience through this period. "If we can get through these periods without shifting from the kind of team we want to be then it's going to make us even stronger once we get everyone back." Postecoglou acknowledges the "historical significance" Seville holds for Celtic as they return to the Spanish city 18 years on from their extra-time defeat to Porto in the Uefa Cup final. "When you walk around Celtic Park, there are images everywhere of Martin O'Neill or our fans enjoying that day in Seville, so of course that has an impact," he said. "But it also motivates you to make your own stamp. That's what I keep saying to this team - they've got an opportunity to create their own moments in this club's history."