Smith, Prosser and Tomlin all come in to face Bradford CityPhil Brown made three changes to the Blues side that lost 2-0 to Plymouth Argyle for his first game in charge against Bradford City.
Paul Smith replaced Daniel Bentley in goal, while Luke Prosser partnered Ryan Cresswell at the heart of defence.
Cresswell was also handed the captain's armband by new boss Brown.
Bilel Mohsni partnered Tamika Mkandawire in the middle of midfield, with Ben Reeves on the left and Kevan Hurst on the right.
The final change saw Gavin Tomlin replace Freddy Eastwood and partner Britt Assombalonga in attack.
Blues: Smith; Clohessy, Cresswell (c), Prosser, Straker; Hurst, Mkandawire, Mohsni, Reeves; Tomlin, Assombalonga.
Subs: Eastwood, Bentley, Corr, Lund, Laird, Leonard, Spillane.