Defender Sowunmi and midfielder Smith were both shown red cards during Yeovil’s 2-1 home defeat to Crawley on New Year’s Day.
Yeovil boss Darren Way will also be unable to call on James Bailey after the captain was ruled out for up to three months with medial ligament damage.
Barnsley midfielder Jared Bird could make his debut after signing on loan with Yeovil until the end of the season.
Bradford quartet Tyrell Robinson, Adam Thompson, Matthew Kilgallon and Dominic Poleon will all return to the squad.
Left-sided player Robinson and defender Thompson have recovered from illness, while centre-half Kilgallon and forward Poleon both returned to training this week.
Midfielder Jake Reeves is still out due to a recurrence of a pelvic problem, which has forced him to miss the last three matches.
Defender Tony McMahon is doubtful and will be assessed after sustaining a knock in the win at Fleetwood on New Year’s Day.
Former Swansea caretaker boss Alan Curtis believes Carlos Carvalhal deserves great credit for the impact he has had at the club.
West Ham have issued life bans to five pitch invaders who came onto the playing surface in the defeat to Burnley last time out.
Brighton centre-half Shane Duffy says his game has come on leaps and bounds thanks to Chris Hughton and Martin O'Neill.
Bournemouth midfielder Lewis Cook says he is ready to take his chance with England should he be handed his senior debut.
Tottenham will have to make a massive offer to land Wilfried Zaha, according to former Crystal Palace chairman Simon Jordan.
Nigel Clough believes keeping Burton in the Championship this season will surpass the achievements of last term's survival.
Garry Monk has challenged his Birmingham players to maintain the high standards they set when beating Hull in their last league game.
Former manager Mark Warburton claims Rangers need to be patient with Graeme Murty or suffer the 'same old problems'.