The Frenchman started with Kieran Tierney in a back three in his first game as Hoops boss, with Sebastian Tounekti and Yang Hyun-jun playing at wing-backs and a four-man 'box midfield'.
Daizen Maeda could not make the most of two good chances as Celtic dominated possession in the first half, but otherwise they struggled to carve out clear-cut chances.
Hearts went ahead two minutes before half-time when Claudio Braga took advantage of a static Celtic defence which expected an offside flag that never came.
The visitors grew in belief and doubled their lead through Oisín McEntee’s header from a 64th-minute corner.
Reo Hatate hit the crossbar, but a Celtic fightback never really materialised and Kieran Tierney’s stoppage-time reply came too late.
Celtic have generally played some form of

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