Rangers knew the January transfer window was crucial if they were to have any chance in this title race.
Returning Celtic manager Martin O'Neill was worried about being considered "too old" to lead the club before returning for a second and then third spell earlier this season, and suggested he was unconvinced about their recruitment under former transfer chief Paul Tisdale.
Rangers moved up to second in the Scottish Premiership and cut leaders Hearts' advantage to three points with an emphatic 5-1 win over Kilmarnock at Ibrox.
Watch highlights from Scottish Premiership match between Rangers and Kilmarnock.
Ante Suto's dream debut goal helped Hibs stage a dramatic late comeback to beat Dundee United 3-2 at Easter Road.
Highlights from the Scottish Premiership match between Hibernian and Dundee United
Marvin Bartley's debut in the Livingston dugout ended in a 2-1 defeat at home to Falkirk in a William Hill Premiership clash at the Home of the Set Fare Arena.
Watch highlights from the Scottish Premiership match between Livingston and Falkirk.
Celtic's hopes of cutting the gap to Hearts at the top of the Scottish Premiership hit a snag after their trip to Aberdeen, due to be shown live on Sky Sports, was postponed less than four hours before kick-off.
Watch highlights from the Scottish Premiership match between St Mirren and Hearts.
Ten-man Hearts dropped three crucial points in the race for the Scottish Premiership title with a gut-wrenching 1-0 late defeat at St Mirren in Paisley.
Martin O'Neill revealed the Celtic board alone turned down the "really tempting" bid of up to £25m for Arne Engels, as he admitted speaking to out-of-contract Alex Oxlade-Chamberlain.
Rangers head coach Danny Röhl is "totally convinced" that his squad has "everything to move forward" as they prepare for a three-horse Scottish Premiership title race.
Danny Röhl claims Rangers' Deadline Day signing Ryan Naderi has been favourably compared to past and present Germany stars Fredi Bobic and Nick Woltemade.
Celtic have signed striker Junior Adamu, winger Joel Mvuka and defender Benjamin Arthur on loan on Deadline Day.
There were 16 signings by Scottish Premiership clubs on Deadline Day, so here's a round-up of what happened, and some deals that didn't...
Full details of every move across the Scottish Premiership during the 2026 January transfer window.
Celtic have rejected Nottingham Forest's third bid for midfielder Arne Engels worth up to £25m.
David Martindale's five-year spell as Livingston manager is over but he remains in a position of authority after making way for his assistant Marvin Bartley.
Tomas Cvancara headed his first goal for Celtic as the champions moved back above Rangers in the Premiership with a 2-0 win over Falkirk.
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