Simon Mignolet’s error gave the Bulgarians an early lead before Rickie Lambert and Jordan Henderson turned it around but a late equaliser denied the Reds a morale-boosting win.
The Bulgarian side took a shock lead in just the third minute when a disastrous Simon Mignolet error allowed Dani Abalo to pounce and score but Rickie Lambert took advantage of some similarly dreadful home defending to equalise only five minutes later for his first European goal.
Raheem Sterling then broke free to cross for Jordan Henderson to give the Reds the lead before half-time but Brendan Rodgers’s side switched off at the death when Georgi Terziev v scored from a corner.
Liverpool now need to beat Basel in their final group game if they are to reach the knockout stages