Oli McBurnie's stoppage time goal gave Sheffield United a point against an abject Chelsea team at Bramall Lane.
Thiago Silva came into a changed defensive line-up for the visitors, and rewarded Mauricio Pochettino's faith by opening the scoring with a volley from a corner after 11 minutes.
However, the Blades equalised just after the half-hour mark, when Jayden Bogle made a precise strike past Dorde Petrovic in the Chelsea goal.
Noni Madueke cut inside after receiving a pass from Cole Palmer, and dispatched a left-footed strike into the Blades' net, but the Blues couldn't hold on, with McBurnie getting a draw for the Blades three minutes into stoppage time.
Here's MailSport's match ratings after Sheffield United 2-2 Chelsea:
Noni Madueke scored Chelsea's second in a sub-par Blues performance at Sheffield United
Oli McBurnie netted a dramatic goal in stoppage time to secure a point for the Blades
Chelsea (4-2-3-1)
Dorde Petrovic - 5 - Not tested very often, but not able to stop Bogle's first-half goal, or McBurnie's stoppage time equaliser.
Axel Disasi - 5 - Moved to right-back in Pochettino's changed defence, but not able to make much of a difference.
Thiago Silva - 6.5 - Got the nod over Badiashile, and proved his selection by scoring a volley after 11 minutes from Gallagher's corner.
Trevoh Chalobah - 5.5 - Booked in the first half for a high boot, but otherwise solid in the centre of a change defence.
Marc Cucurella - 5.5 - Relatively untroubled at the right-hand side of the defence, until he made a cynical late challenge and got booked for his troubles.
Moises Caicedo - 5 - Made a key block to deny Brereton Diaz a golden opportunity to equalise, but otherwise struggled.
Enzo Fernandez - 6 - Another solid but not spectacular in the heart of the Chelsea team.
Cole Palmer - 6.5 - Made another of his customary contributions to the Chelsea side by turning provider for Madueke, before being replaced by Chukwuemeka.
Conor Gallagher - 6 - His corner-kick found Silva unmarked in the middle of the box, in a rare highlight for the Blues star.
Noni Madueke - 7.5 - Came in for Mudryk in the Blues attacking line, and proved to be a star man, getting Chelsea's second goal. Replaced by the Ukrainian late on.
Nicolas Jackson - 6 - The Senegalese striker was not able to do much up front, and was replaced by Casadei in stoppage time.
Substitutes: Chukwuemeka (for Palmer 74') - 6 -Brought on for Palmer, but not able to effect much of a change.
Mudryk (for Madueke 82')
Badiashile (for Cucurella 90')
Casadei (for Jackson 90')
Subs (not used): Bettinelli, Sharman-Lowe, Sterling, Washington, Gilchrist
Manager: Mauricio Pochettino - 6.5 - Not a dominant Blues performance, and maybe would have been lucky to have got back-to-back wins.
Jayden Bogle had scored a first-half equaliser for the Blades as part of a solid midfield showing
Sheffield United (3-5-2): Grbic 5; Holgate 5 (McAtee 76), Ahmedhodzic 5, Robinson 5 (Souza 90); Bogle 6, Hamer 7, Arblaster 6, Osborn 6, Trusty 6 (Archer 87); McBurnie 7, Brereton Diaz 6.5
Subs (not used): Foderingham, Norwood, Slimane, Larouci, Osula, Brooks
Manager: Chris Wilder 6.5
Referee: Robert Jones 6