The Reds were held at home by the bottom side, who registered only their third point of the campaign.
Joshua Zirkzee's deflected opener was levelled by Ladislav Krejci's header towards the end of the first half, and there was a lack of urgency until Patrick Chinazaekpere managed to force home in the last minute of normal time, only for VAR to confirm he was offside, when pouncing on the rebound after Benjamin Sesko's shot was saved by Jose Sa.
The boss had this to say to Sky Sports and MUTV afterwards, including an explanation as to why Zirkzee was withdrawn at half-time.