Dinamo Zagreb vs. Chelsea result: Mislav Orsic delivers UEFA Champions League shock as pressure mounts on Thomas Tuchel
The Croatian struck in the first half as the Blues lost a third successive down game all competitions under Thomas Tuchel, who was taking charge for the 100th time for the club.
Pierre- Emerick Aubameyang made his Chelsea debut following his transfer from Barcelona with Kepa Arrizabalaga handed a launch due to a minor injury suffered by Edouard Mendy.
The callers dominated the opening exchanges but were caught out on the break as Orsic got in behind the defence to prod a clever finish past Kepa and over the line.
The Croatian titleholders grew in confidence as the half progressed and could have doubled their advantage through Arijan whose ferocious strike from 20 yards was saved by Kepa
Hakim Ziyech replaced Cesar Azpilicueta for the launch of the alternate half as Chelsea looked to increase the tempo of their play.
The Blues set up the reverse of the net after 50 twinkles when Aubameyang finished from close range, but the flag was raised for an offside against Ben Chilwell.
Stefan came near to doubling Dinamo's advantage, striking the bar with a long- range shot, before James also struck the woodwork for Chelsea in the final twinkles of the match.
But an equaliser noway came for Chelsea, who have now lost their once three matches down from home for the first time since December 2020 under Frank Lampard.