Brendan Rodgers claimed 10-man Celtic's 2-0 defeat at Hearts was "decided by the officials" as he lamented an early red card for Yang Hyun-jun and the award of the penalty that allowed the hosts to take the lead.
The Hoops arrived at Tynecastle knowing a victory would have taken them back to the top of the cinch Premiership after title rivals Rangers suffered a shock home loss to Motherwell the previous day.
Celtic's chances were undermined in a dramatic opening quarter of an hour when Cork's Adam Idah saw a penalty saved by Hearts goalkeeper Zander Clark a few minutes before Yang was sent off for catching Alex Cochrane in the face with a high boot.
The South Korean was initially yellow-carded before match referee Don Robertson upgraded it to a red after being advised by VAR John Beaton to review the incident on the pitchside monitor.
Rodgers was further riled when Hearts were awarded a penalty in the 40th minute after a headed clearance from Liam Scales landed on Tomoki Iwata's arm as he rose to try and head it out of the box. Jorge Grant scored the spot-kick and Lawrence Shankland netted the hosts' second goal in the 56th minute.
"My feeling is that the game was decided by the officials, on the field and outside of the field," said Celtic boss Rodgers.
"You guys (the media) will know me long enough to know that I don't really comment on officials - they make mistakes and whatever else - but today that felt like really really poor officiating.
"The first one is the sending off when there is no force. Show a still image of that and of course you will see a foot up with the head near it, but it's not the reality of the move.
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