Vardy gave them the lead from a penalty after he was fouled by keeper Tsintotas. goalscorer
But Tankovic gave AEK hope after ghosting in behind the defense moments after coming off the bench.
The former Fulham player almost equalized two minutes later but smashed his 10-yard shot over the crossbar.
Cengiz Under, on his first start for Leicester, almost restored the two-goal lead but his curling effort hit the woodwork.
In the end, they would not need another goal.
Brendan Rodgers revealed before the game that defenders Jonny Evans and Castagne are injured, with the latter likely to be out until after the November international break.
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