Marco Matias faces several weeks on the sidelines after having hernia surgery earlier this week, The Star has learned.
The Portuguese forward, who has claimed two goals in 11 appearances since arriving from Nacional, flew out to see a highly-regarded surgeon in Germany on Tuesday.
Having gone under the knife, Matias, signed for £1.14m, is likely to miss the Owls’ next three Championship fixtures against Nottingham Forest, league leaders Brighton and Hove Albion and Charlton Athletic.
Wednesday recently bolstered their forward options by bringing in striker Gary Hooper on loan from Norwich City. The 27-year-old is likely to be on the bench, with Carlos Carvalhal set to recall Fernando Forestieri up front.
Goalkeeper Keiren Westwood will also return after missing out on the win over Arsenal in the Capital One Cup due to an ankle problem.
“He didn’t play because we don’t take risks,” said Carvalhal. “We have to be careful with the players. Now Keiren is 100% ready to play.”
Alex Lopez could be named in the match-day squad after recovering from a thigh niggle, but Michael Turner (knee) and Modou Sougou (shoulder) remain sidelined.
Carvalhal prefers to focus on players who are available for selection rather than his injured stars.
“It is very strange to me to talk about the injuries,” he admitted. “Usually I never talk about injuries as I’m not a doctor and can’t give you an exact diagnosis. These questions are very difficult for me because I can’t say whether he is ready or not. I don’t want to make any mistakes with the diagnosis.”
The Wednesday head coach sat his players down on Thursday and made them watch the DVD of their fine display against Arsenal.
“I showed a video to the players on why we are winning,” he said. “That is the best preparation we can do. We have to understand what we are doing and what we must improve.”