The visitors had a first-half penalty award overturned after Lawrence Shankland’s header came off Liam Scales’ arm

After the break, Nicolas Kuhn’s cross hit James Penrice’s hand and the review resulted in record signing Arne Engels scoring his first Celtic goal from the spot

Luke McCowan also opened his Celtic account with a late strike, confirming Hearts slipped a point adrift at the bottom of the Scottish Premiership

Brendan Rodgers’s side lead Aberdeen on goal difference and host Slovan Bratislava in Wednesday’s Champions League opener

Wins for Celtic, Aberdeen, Hibs & County as 10-man Killie draw at St Mirren

Keep up to date with Celtic

, who take on St Mirren next, ultimately ended in a seventh straight defeat in all competitions

Referee Colin Steven had been quick to point to the spot after the Scales incident but a prolonged VAR check ended with Celtic restarting on a dropped ball

Neither Steven nor his assistant initially penalised Penrice, whose hand was outstretched, and it was more disappointment for Hearts as VAR ruled in the hosts’ favour

Engels, signed from Augsburg for a reported £11m, was given the responsibility rather than Reo Hatate and the new Belgium cap, 21, showed no signs of nerves as he rolled the ball past Craig Gordon

Hearts’ best chance came just before the McCowan goal from the edge of the penalty area. Musa Drammeh stretched out a foot to meet fellow substitute Blair Spittal’s low cross but Kasper Schmeichel saved on his line

And the clean sheet meant Celtic recorded five wins without conceding at the start of a season for the first time since 1906 – only the second time in their history.