Carlos Carvalhal had no complaints about his side's performance in the 1-1 draw with Barnsley but the head coach was frustrated by the conceding of an equaliser from a set-piece.
Sam Winnall returned to his former club, amid constant jeers, and looked like he was going to have the last laugh after putting Wednesday in front, latching onto a mistake by Adam Davies.
However, the lack of a second goal proved costly to Carvalhal's side and Barnsley deservedly snatched an equaliser in injury time through Angus MacDonald who headed in Adam Hammill's cross.
The display by the Owls was not a concern for Carvalhal, but the manner of the goal they let in certainly was.
"They scored from a free kick which is something we have been working hard on." he said. "We can't concede these kind of goals during the game or in extra time but this is part of the game. Barnsley scored and at the end we must accept the score but we have the feeling, maybe because of the time of the goal, we didn't feel during 85 minutes there was a threat on our goal.
He added: "There are thing we must correct. These kind of goals we can't take, corners and free kicks, especially in this part of the season.
"We played for the three points, the players played with a good discipline, not fantastic football. We lost the concentration in one crucial moment in extra time. I think the players did the maximum, they gave everything on the pitch and that is important.
"The Sky Bet Championship is a very hard competition. The teams never give up, and it's good to achieve one goal but it's important to achieve a second to finish everything.
"If you don't score the second goal all teams are very strong mentally and believe they can score in the last minutes, which is what happened today."