Celtic F.C. their sixth successive league title on 2 April 2017, with a record eight league games to spare. As Celtic's unbeaten domestic run continued, they subjected Rangers to their heaviest defeat at Ibrox since 1915, 5–1, on 29 April. Celtic's 2–0 win over Hearts on 21 May saw them finish 30 points ahead of second-placed Aberdeen in the league, with a record 106 points, and the team became the first Scottish side to complete a top-flight season undefeated since Rangers in 1899. On 27 May 2017, Celtic clinched their fourth treble by defeating Aberdeen 2–1 in the Scottish Cup final. The
2017–18 Celtic F.C. season Celtic would face Rosenborg (Norway) in the Third Qualifying Round of the UEFA Champions League. The Norwegian champions overcame Dundalk to set up their first meeting with the Scottish champions since the 2001–02 UEFA Champions League group stage. In October 2001, an Alan Thompson free-kick secured a 1–0 victory for Celtic in Glasgow. Later that month, Martin O'Neill's team succumbed to a 2–0 defeat in Trondheim, with former Celtic player Harald Brattbakk scoring both goals. Brendan Rodgers' side were forced to play without a recognised striker in the first leg, which finished goalless. Injuries to Moussa Dembélé and Leigh Griffiths