Hearts travelled to Turkey to face Istanbul Başakşehir with only pride left to play for, whilst their hosts had top spot in the group in their sights.
Robbie Neilson made 6 changes from his side’s weekend win at Ross County, as Euan Henderson came in up front for his first start since April 2021 against Raith Rovers.
The Gorgie side made the worst possible start, going behind after just four minutes.
Burundi midfielder Youssouf Ndayishimiye peeled away from Lewis Neilson at a corner to nod past Craig Gordon, on a night when the stopper equalled the most European appearances in a Hearts jersey.
Goal scorer Ndayishimiye may have counted himself lucky to still be on the park 10 minutes later, after the officials failed to spot his studs connecting with the calf of Jorge Grant.
Hearts were seeing their fair share of the ball but just after the half hour mark they were two down.
Craig Gordon came rushing out of his box in an attempt to clear a through pass, only to mistime his lunge and let Serder Gurler in to dispatch into an empty net.