Joao helped Sheffield Wednesday to a 3-0 win at the City Ground on Boxing Day.
Joao was handed only his second start of the season as Wednesday travelled to Nottingham Forest in their first game without Carvalhal - the man who brought the Portuguese striker to Hillsborough 18 months ago - on Boxing Day.
Lined up in an unfamiliar inside forward's role, the 24-year-old justified Lee Bullen's decision to bring him in from the cold, as he turned in an impressive display which he capped with the final goal in 3-0 win for the Owls.
And Wednesday fans are hoping he can recapture his early form for them in the campaign's second half.
Said this before but I think Joao is a real talent, get someone to nurture and guide him and could be some player #swfc— Coops1867 (@philcooper15) 27 December 2017
Joao needs a run in the side and a manager who believes in him. He's got pace, skill and power- just needs to find consistency #swfc— Rob Andrews (@Rob_Andrews95) 26 December 2017
All the Lucas joao haters are quiet tonight, watch that goal today the lad has got something special #swfc— Jonny Hardy (@jonnyhardy7) 26 December 2017
That looked like the #swfc of 2 seasons ago, defended as an 11, broke with pace and broke in vast numbers. Many plus points from today but thought Reach was the MOM just from Joao and Wildsmith. There is a player in Joao if somebody can channel him, scary at times today— Matt Summerhill (@MattSummerhill) 26 December 2017
Joao was superb today an absolute menace to forest. Great performance aided slightly by some of them saves from wildmsmith in first half but fully deserved that... more of that thanks lads— BW (@bw_swfc) 26 December 2017
Back from City Ground. Adventure from Bully and players, aided by some very good saves from Joe W got us the much needed and deserved win. Thought Joao was particularly good. Need to sustain that level now #swfc— WarOfTheMonsterTruck (@SheffWedWOTMT) 26 December 2017
Joao was brilliant today, Reach ran the show - what a nice change to be positive and buzzing after a match! #swfc— Paul Sewell (@PaulGSewell) 26 December 2017
Joao has a stormer today, brilliant tracking back and frightening going forward, such a frustrating player with how inconsistent he is— Daniel (@Daniel_Swfc) 26 December 2017
Said for ages Joao should be playing, energetic, no fear, brilliant player #swfc— Josh Gregory (@Josh_S_Gregory) 26 December 2017
Goals from Adam Reach and Jordan Rhodes (penalty) had Sheffield Wednesday 2-0 up before Joao's strike at the City Ground, which closely followed another attempt of his which was tipped on to the crossbar by Forest keeper Jordan Smith.
It ensured the Owls' first win in little under two months and seventh in a row against the Reds.
Bullen told reporters afterwards he has been asked to take the reins until 1st January, and potentially the FA Cup trip to Carlisle United the following Saturday.