Celtic legend Martin O'Neill believes the club's trophy challenges this season should serve as a wake-up call after years of dominance in Scottish football. The Northern Irishman, returning for his second spell as interim manager, acknowledged that Celtic's 13 Premiership titles in 14 years have left fans spoiled by success. Hearts' unexpected title challenge has exposed vulnerabilities in the Glasgow giants' once-unassailable position.

Celtic's 2-2 draw with Rangers last weekend saw Hearts extend their lead at the top of the table, with Celtic now five points adrift of the league leaders. The Old Firm rivals face off again in the Scottish Cup quarter-finals at Ibrox, where only one can progress to the semi-finals. Both clubs face the prospect of a trophyless season for the first time in over 70 years.

Rangers manager Danny Röhl admitted the pressure to deliver silverware this season, despite inheriting a squad 13 points behind Hearts when he took over in October. The German coach believes his team can silence Celtic's 7,500 travelling supporters with the same intensity that saw them race into a 2-0 lead in their last meeting. With both clubs desperate to avoid a historic trophy drought, Sunday's clash carries immense significance for their seasons.