Owls chief Carlos Carvalhal insists Lucas Joao still has much to learn despite the striker’s impressive display in the 4-1 Capital One Cup success over Mansfield Town.
The 21-year-old, signed from Nacional for a fee believed to be in the region of £2m, capped his full debut with a goal as Wednesday cruised into the second round.
Joao led the line intelligently, running the Stags’ defence ragged and was deservedly given a standing ovation when brought off with 14 minutes remaining.
Carvalhal said Joao’s virtuoso performance was “not strange” but stressed: “He is a very young player.
“He is a baby but with very big potential. He has everything to be a top player but we must give him time.
“It is not good to create too many expectations around him because he is a very young player. He has had to grow up very quickly in the last month. We must give him and support.
“I’m very happy with how he played but he needs time.”
The Portuguese has expressed his delight over starting his reign with back-to-back Hillsborough wins.
“I’m very happy with the players,” he said. “We played good football. We respected our opponents and played with good discipline.
“In some parts of the match, we played really well. We scored four but I think we could have scored more.
“I’m very happy with the score but it is a little step in this competition.”
For the second match in a row, Darryl Lachman, Stevie May and Sergiu Bus were left out of the match-day squad.
“They are players in the squad,” said Carvalhal. “We have played two matches and I have chosen the best 18 players to win the games. We have more than 20 players.
“There are players all over the world who can’t get into some teams.”