Sheffield Wednesday defeated Charlton Athletic 3-0 on Saturday.
The Owls consolidated their place in the top six with a 3-0 victory over the Addicks on Saturday, with Lees and Fernando Forestieri firing before an El-Hadji own goal completed the scoring.
Lees, a former Leeds United centre-back, will have been keen for his side to keep a clean sheet against Charlton yet in the build-up to the clash he was given a further task by Carvalhal.
“The manager has been saying to me all week he wanted me to get a goal, we worked on a few things at the back end of the week and luckily it paid off so I’m really happy,” he explained.
“Charlton were very deep, there wasn’t much space to get in behind and explore and it made it difficult for us.
“But the timing of the goal was good because it forced Charlton to come out and when they attempted to bring men forward we could pick them off.”
Lees fired the Owls ahead just after the hour mark as he broke clear of his marker to nod home from close range, a goal that seemingly opened up the tie and gave the hosts more room to work with.
It was the 25-year-old defender’s third Championship goal of the season, but his first since a 3-2 success over Fulham way back in September before he missed a portion of the season with injury.
Lees has great aerial ability and height to trouble the opposition from set-pieces, yet it had been a while since he found the net and Carvalhal was seemingly keen for him to make more of an impact on Saturday.