The Portuguese has scored six goals in the Championship this season.
The 22-year-old has endured an inconsistent start to life at Hillsborough, but has recently shown glimpses that suggest that he is starting to really find his feet in Carlos Carvalhal's side. And Bannan believes that Joao deserves a lot of credit for the quality he has shown since joining the Owls in the summer.
"Lucas is a talent. He has been brilliant over certain parts of the season. He was very good when he came on Saturday. He gave us something different. He did really well and it was good seeing him play well," he told the Star.
"Lucas is still a young boy and learning. For the foreign players coming over here, it is hard in the first season."
Despite scoring seven goals in all competitions before the end of November, it is perhaps his performances in the most recent part of the campaign - during which he has actually only managed one goal - that have arguably given supporters more reason for optimism, as he has found some consistency that should give Carvalhal the confidence to suggest that he can be relied upon.
Nevertheless, with the likes of Gary Hooper, Fernando Forestieri and Atdhe Nuhiu seemingly ahead of the former Nacional man in the pecking order, he will have to start backing up his talent with more goals if he hopes to earn more opportunities in the first-team.
Luckily for Wednesday, it seems that Bannan is backing the forward to build on his promising start and soon show exactly why he was brought to the club in the first place.