Joao was one of the Owls’ stars of the season over the early part of the campaign, and he scored five goals across October and November.
The youngster’s good form caught the eye of the Portuguese national side, who rewarded him with his first two senior caps.
However, Joao’s form seems to have dipped after his whirlwind start - and he has struggled since 2016.
Joao has scored just once in his last 18 appearances, but Carvalhal believes that striker is starting to get back to his best.
CC: Lucas is a boy and has a lot of good examples in the team to learn from. He is in a good way now #swfcLIVE— Sheffield Wednesday (@swfc) March 10, 2016
Carvalhal has already admitted that Joao got carried away with his initial success at Hillsborough.
The 22-year-old’s dip in standards has caused him to drop down the pecking order at the Yorkshire side, with the likes of Gary Hooper and Atdhe Nuhiu jumping ahead of him.
Joao’s next chance to impress could come at the weekend, when Wednesday take on Nottingham Forest.