Celtic manager Brendan Rodgers conceded his side have made a disappointing start to the season after they slipped to a second defeat in six games, losing 2-1 to Kilmarnock.
Leigh Griffiths gave the champions the lead after 34 minutes at Rugby Park but, after Chris Burke's equaliser half an hour later, Celtic were undone by as stoppage-time winner from Stuart Findlay.
The result leaves the Bhoys fifth in the table after six games, six points behind league leaders Hearts, who beat Rodgers' men 1-0 earlier in the season.
"It hasn't been a great start to the campaign but we have to accept that," Rodgers told a post-match news conference.
"We're the only ones who can make it better by playing better and getting more consistent results.
"It's been very bitty but we have to go away and work and see where we can be better."
Celtic meet St Johnstone in the League Cup on Wednesday before entertaining Aberdeen at Celtic Park on Saturday, and Rodgers believes fatigue from Thursday night's 1-0 victory over Rosenborg in the Europa League may have been a factor.
"I take responsibility," he added.
"We made the changes to try and get that energy and brightness and sharpness that may not be there if you've played late on a Thursday night.
"I'd have been disappointed to draw the game but to actually lose is bitterly disappointing."
15. Oktober 2018
|Neymar pleased Brazil will not face Messi in Argentina clash|
|Buccaneers fire defensive coordinator Mike Smith after loss to Falcons|
|´Surprised´ Deschamps accepts he could´ve made more effort with Koscielny|
|Kuwait 0 Australia 4: Socceroos deliver win for new coach Arnold|
|Van Dijk fit for Liverpool return - Koeman|
|NBA 2018-19: Eastern Conference predictions|
|NBA season preview 2018-19: Five rookies to watch|
|Denly replaces injured Dawson in England ODI squad|
|Low confirms under-fire Neuer to start against France|
|NBA 2018-19: Western Conference predictions|
|Bolt offered two-year deal by European club, says agent|
|NBA 2018-19: LeBron the Laker - what it means|
|Griezmann ahead of Mbappe for Ballon d´Or - Modric|
|Billy Vunipola ruled out with fractured arm|
|Get the chequebook out! - Mayweather talks up potential Khabib clash|
|Amla ruled out of Australia tour|
|Class act Hamilton more complete than ever - Wolff|
|NBA 2018-19: It´s a big season for - Ball, Kawhi, Carmelo, Love & Cousins|
|Bellew: I have no fear of Usyk|
|Birthday boy Ozil is the most creative player in Europe|
|CSA reveals De Villiers and Rabada involved in Mzansi Super League|
|FA condemns England supporters involved in trouble in Seville|
|Gascoigne hits back over Scottish Hall of Fame snub|
|NBA 2018-19: LeBron closing in on Jordan, Curry chasing Miller and Allen|
|Ter Stegen should start ahead of Neuer for Germany – Matthaus|
|England´s Sterling impressed by Sancho´s work ethic|
|Vandoorne seals switch to Formula E|
|Halep to end 2018 as world number one|
|Sri Lanka´s Jayasuriya charged by ICC with breaching anti-corruption code|
|Vermaelen out for six weeks with hamstring injury|
|LeBron and Irving did not fall out, says ex-Cavs trainer|
|Ramsey out of Wales´ clash with Republic of Ireland|
|Bolt angry with drugs test|
|Bad luck is not a coincidence – Kimmich concerned by Germany form|
|Mahomes: Chiefs need to win like Brady and the Patriots|
|Schuster warns Real Madrid not to panic-buy striker in January|
|We´re here to win! - Paine not happy celebrating a draw|
|Injured Thauvin out of Germany clash|
|Southgate hits out at early Premier League start|
|Modric to Inter talk is ´fantasy´, says Guardiola|
|Pats hand first loss to Chiefs after wild shoot-out|
|Cowboys, Ravens dominate as Pats beat Chiefs in NFL classic|
|Brady becomes first QB to 200 regular-season wins in NFL|
|Red Sox level series against Astros|
|Mbappe leaves red-faced Dembele on his backside|
|Red Sox ace Sale admitted to hospital with stomach illness|
|From UFC to NFL? McGregor throws pass for Cowboys|
|Ancelotti praises ´dangerous´ Mbappe|
|Uncapped Papalii named in All Blacks squad|
|Kane would star in LaLiga – Ramos|
|Guardiola unsure about Man City´s Champions League chances|
|Dzeko: Premier League return? You never know|
|Gurley dominates to help Rams beat Broncos|
|Butler expected to play Timberwolves´ opener against Spurs|
|I´m no wizard – Mancini asks for patience with Italy|
|The Messi and Ronaldo era is phenomenal – Guardiola|
|Dolphins defeat Bears in OT with 47-yard field goal|
|Almirola picks up win at Talladega|
14. Oktober 2018
|Wigan´s Sarginson wanted Grand Final glory in memory of brother|
|McLeish: Scotland keep shooting themselves in the foot|
|Sarries´ walking wounded a concern for Jones|
|Poland 0 Italy 1: Biraghi seals last-gasp win to keep final-four hopes alive|
|Seahawks top Raiders with blowout win in London|
|In-demand Hogg hints at Glasgow exit|
|Holder calls on Windies batsmen to step up after India whitewash|
|France´s World Cup win hurt me - Koscielny retires from international football|
|Bailey performs U-turn on Jamaica call-up|
|Evans becomes Buccaneers´ all-time leading receiver|
|Overlooked Alba is one of the world´s best, says Ramos|
|Del Potro a major ATP Finals doubt due to fractured patella|