Carvalhal was hosting his press conference earlier today and told reporters in attendance that Aiden McGeady would be fit enough to play tomorrow night against Queens Park Rangers.
However, he was unable to confirm whether Sam Hutchinson would be fit, after picking up a knee injury earlier this month.
"Aiden is training normal and can be in the 18 if we need him," the Portuguese boss confirmed.
"Let's see on Sam. He is training but has a small pain. We must wait until tomorrow to make the final decision."
McGeady’s return will be a boost for Wednesday, as they missed the Everton loanee’s creativity in their weekend match against Preston North End.
The Owls were beaten 1-0 by Simon Grayson’s side, and they failed to show the same level of attacking threat as they have in recent weeks.
McGeady has been a key part of Wednesday’s line-up since joining in January and he is likely to feature against QPR.
Hutchinson, meanwhile, has missed out on playing in Wednesday’s last two matches.
The utility man did come through a training session today, but Carvalhal’s caution suggests that he may not be fit enough to return to the starting line-up on Tuesday evening.
If Wednesday beat QPR tomorrow they will protect their place in the play-off spaces.