The Scottish Premiership title race in 2026/27 is shaping up to be one of the most data-rich battles in the league's modern era. Celtic and Rangers have dominated the top flight for years, but the numbers this pre-season tell a more complex story than simple Old Firm supremacy. Heart of Midlothian and Aberdeen are both carrying genuine xG improvements into the new campaign. So who actually wins this thing?
Celtic: The xG Machine
Celtic remain the statistical benchmark in Scottish football. In 2025/26 they posted an xG of 2.31 per game — the highest in the division by a distance. Their pressing system under their current setup generates roughly 34 PPDA-pressures per 90 minutes in the opposition half, a figure that would be competitive in the Championship south of the border.
The key number for Celtic this season is their expected goals against: 0.71 xGA per game last term. That defensive solidity, combined with an attack that consistently overperforms xG by around 0.15 goals, makes them the statistical favourites. When you add home advantage at Celtic Park — where they averaged 2.6 goals per game last season — the case is hard to argue against.
Their summer transfer activity has focused on reinforcing the engine room. Midfield creativity metrics show they averaged 11.4 progressive passes into the final third per 90, and that number should only rise. Title probability based on last season's underlying data: 54%.
Rangers: The Counter-Punch
Rangers' problem last season wasn't goals — they scored 82 in the league, second only to Celtic. Their problem was defensive fragility at the back end of the campaign. Between February and May, their xGA crept up to 1.42 per game, a figure that conceded the title on points rather than quality.
The interesting stat for Rangers heading into 2026/27 is their set-piece efficiency. They ranked first in the Premiership for goals from set pieces (23), and their delivery quality — measured by shot creation events from dead balls — improved by 18% across the season. If they can shore up the leaky second-half-of-season performances, they are genuine challengers.
Rangers averaged 58.3% possession across the campaign but only converted 14.2% of their shots — a figure that, if it regresses upward toward their expected 16.1%, adds roughly 6-8 goals across the season. Title probability: 31%.
Heart of Midlothian: The Dark Horse
Hearts finished third last season but their underlying numbers were arguably second-best. Their xG differential — the gap between goals created and goals conceded on an expected basis — was +0.68 per game, ahead of Rangers' +0.61. They simply didn't convert when it mattered most, finishing with a -0.22 underperformance against xG in the final quarter of the season.
The summer additions at Tynecastle have addressed the one glaring weakness: central midfield press resistance. In 2025/26, Hearts were bypassed through the middle at a rate of 4.3 times per 90 — above the league average of 3.7. If that holds tighter in 2026/27, they have the squad to genuinely push the Old Firm. Title probability: 10%.
Aberdeen: The Wildcard
Aberdeen's data is quietly encouraging. Their expected goals from open play improved by 23% between the first and second halves of last season — suggesting a system that gets better as the manager's ideas bed in. Pittodrie also remains one of the toughest away venues in the division; opposition teams score at a rate of 0.91 goals per game there, well below the league average of 1.18.
They won't win the title. But they could finish second. Title probability: 5%.
The Verdict
On the numbers, Celtic start as heavy favourites. Their xG output, defensive metrics, home record and squad depth all point in the same direction. Rangers remain capable of mounting a challenge if their second-half-of-season defensive drop-off is addressed, and Hearts are the most interesting outside bet the data has produced in years.
But Scottish football loves to confound the stats. That's why we watch.
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