The Cottagers are hoping to bounce straight back into the Premier League after relegation last term.
They are top of the Championship at present with seven points from three games, but there are teams with a game in hand.
Carvalho was the start of the show against Millwall, getting a goal and assist for the Londoners.
The 18-year-old assisted Aleksandar Mitrovic for the first goal, before scoring to make it 2-0 within eight minutes.
Millwall rallied back, but could not snatch a point.
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