Celtic went into Wednesday night's game with St. Johnstone in fine form, and even had the chance to go nine points clear at the top of the Scottish Premiership with a win.
Yet in a surprise result, St. Johnstone left Celtic Park with all three points after a shock 1-0 win over Ronny Deila's Bhoys, with Danny Swanson scoring the only goal of the game in the 54th minute.
Celtic's game in hand has now gone, but they are still six points clear of second placed Aberdeen despite the defeat to St. Johnstone.
It was a frustrating night all round for Celtic, and especially for midfielder Stuart Armstrong, who spoke to the media after the final whistle.
Armstrong, 22, was Celtic's big money signing in the January transfer window, and has made a strong start to life under Deila with two goals in seven games.
However, he had no such luck against St. Johnstone, and was even booked on a disappointing night for the club - and admitted that he's still adjusting to the level of expectation from Celtic fans, as reported by Celtic's official Twitter account.
SA: “Every game is a big game here and you realise that winning is part of life here. Getting your head around those demands is good." (MH)— Celtic Football Club (@celticfc) March 4, 2015
Armstrong moved to Celtic from Dundee United, so it's quite the step up for the midfielder - and playing for a club the size of Celtic will naturally take some time to get used to.
However, with time and plenty of first team football, Armstrong will certainly adjust to life at Celtic quickly having already made a strong impression so far.