The Sky Blues fell to a 2-0 defeat to Hull City, despite Ian Maatsen's late goal being controversially chalked off.
Two first-half goals from Richard Smallwood and Ryan Longman saw Shota Aveladze’s Hull City side leave the Coventry Building Society Arena with all three points.
The Sky Blues mounted attacks with hopes of comeback, but it was not to be for the Sky Blues who were without Mark Robins for a second successive game.
With only four minutes on the clock, Richard Smallwood struck home to give the Tigers an immediate lead.
Gustavo Hamer’s curling effort was a sign of a swift response from the Sky Blues and was promptly succeeded by Matty Godden’s swivel and hit- both clawed away by Matt Ingram.
Tigers star man Keane Lewis-Potter drifted forward and unleashed a shot from range, but was equally met by an impressive Simon Moore save.
The resulting corner drop favourably to Ryan Longman whose thunderous effort cannoned in off the crossbar, leaving Moore no chance in net, thus giving the away side a two-goal lead.
A wave of Sky Blue dominance followed, nearly amounting to a comeback goal when Callum O’Hare’s body feint and left-footed attempt was palmed away by Ingram once more.
HALF-TIME: Sky Blues 0-2 Hull City
An outstretched leg of Godden earned the Sky Blues a corner, from which Jake Clarke-Salter leapt highest to test Ingram, with that sequence being the first highlight of the half.
Tom Eaves was next to test his luck as he race ahead and set his sights on goal with his counterpart Godden winding up a strike moments later.
The Sky Blues thought they had a goal back when Ian Maatsen's volley appeared to cross the line - courtsey of a deflection - but referee Thomas Bramall's decision not to award the goal proved costly in any attempt to salvage a result.
FULL-TIME: Sky Blues 0-2 Hull City
Scorers: Richard Smallwood (4’), Ryan Longman (28')
Yellows: Ian Maatsen (90')
Attendance: 15,587 (501 away)
Sky Blues XI: Simon Moore (GK), Fankaty Dabo, Dom Hyam, Jake Clarke-Salter, Ian Maatsen, Ben Sheaf, Jamie Allen (Jordan Shipley 70’), Gustavo Hamer (Martyn Waghorn 78’), Callum O'Hare, Matty Godden (C) (Fabio Tavares 70’), Viktor Gyokeres.
Unused Subs: Ben Wilson (GK), Josh Reid, Ryan Howley, Will Bapaga.
Hull City XI: Matt Ingram (GK) Alfie Jones, Sean McLoughlin, Jacob Greaves, Ryan Longman, Richie Smallwood (C) (Callum Elder 78’), Regan Slater (Greg Docherty 74’), Brandon Fleming, George Honeyman, Keane Lewis-Potter, Tom Eaves (Allahyar Sayyadmanesh (85').
Unused Subs: Harvey Cartwright, Tom Huddlestone, Di’Shon Bernard, Marcus Forss.