Hooper joined the Owls on loan from Norwich City on Tuesday evening, and there is great deal of excitement around his arrival at Hillsborough.
However, Carvalhal has suggested that it is not a guarantee that 27-year-old will come straight into his starting line-up, with the Portuguese boss keen to assess his match sharpness.
“Let’s see if Gary will be ready or not,” Carvalhal said. “We will see how he trains and how he understands the way we are playing and then make a decision.”
Hooper has joined Wednesday until January, and the Yorkshire side will be hoping that he can end their search for a goalscorer.
Wednesday have struggled to find a regular marksman for a number of years, but Hooper is a renowned goal-getter in the Football League.
The former Celtic man faces a fight to win his place in Wednesday’s starting line-up, though, as they have been in such good form.
The Owls won their last match 3-0 against Arsenal, and they are now unbeaten in nine matches in all competition , meaning that any Wednesday player that does have to make way for Hooper is likely to feel hard done by.