The Owls are currently sat just outside the play-off places in the Championship table, but Palmer hasn’t been impressed by the Portuguese boss.
The former Wednesday midfielder believes that Carvalhal’s rotation policy has harmed his team’s chances, and he believes that Stuart Gray was doing a much better job at Hillsborough.
“I think rotation is going to be Carlos’s undoing this season,” Palmer said.
“No disrespect to Carlos; I am not knocking the guy, he has done a good job.
“But he should be doing a good job with the resources he has got. For me, Stuart Gray did an even better job with less resources. That’s a fact.
“For me, Wednesday are under-achieving. They are playing some good, attractive football but they should be doing better than what they are doing.
Carvalhal has been keen to utilise the entirety of his squad this season, and he has rarely picked the same line-up for two matches running.
Picking Wednesday’s starting teams has been a difficult task, but they have still made progress.
The Owls have been very difficult to beat, and they are much better placed this time around than they were last season.
Gray led Wednesday to a 13th placed finish during the 2014/15 campaign, but they rarely looked like making a promotion push.