Striker Kayden Jackson and midfielder Jon Nolan have been banished to training with the U23s squad by manager Paul Lambert.
Jackson, 26, has been with the squad coached by Kieron Dyer and Terry Butcher since his red card in the Sunderland match, Lambert having made no secret of his annoyance with the striker, who was dismissed in the 10th minute for a studs-up challenge, following the match.
Nolan, 28, showed his frustration to Lambert having travelled to Crewe at the end of last month and only been told he was left out of the matchday 18 shortly before the game.
Jackson was available for the postponed fixture at Shrewsbury and last night's game having served his ban but was not involved in the squad for either game. Nolan has not been in the 18 for the last three matches.
Both were linked with moves away from Portman Road on transfer deadline day but with the club not receiving offers they saw as acceptable.