Lee Tomlin starts for the 2nd consecutive match
Another strong, attacking team picked by manager Neil Harris, with Lee Tomlin selected to pull the strings in behind Robert Glatzel once again.
It will be a huge boost for City that Tomlin is deemed fit enough to start what is undoubtedly the biggest match of the season to date.
Elsewhere, Will Vaulks comes in for Marlon Pack as the only change to this Bluebirds side.
Leandro Bacuna is preferred to Dion Sanderson at right back.
For Boro, Britt Assombalonga is named on the bench and Neil Warnock has named only seven possible replacements.
STARTING 11Alex Smithies
Leandro Bacuna
Sean Morrison
Curtis Nelson
Joe Bennett
Will Vaulks
Joe Ralls
Lee Tomlin
Junior Hoilett
Nathaniel Mendez-Laing
Robert Glatzel
SUBSTITUTESNeil Etheridge
Aden Flint
Sol Bamba
Dion Sanderson
Brad Smith
Marlon Pack
Josh Murphy
Callum Paterson
Danny Ward