The 17-year-old has been on the Blues' radar since last year's Under-17 World Cup, where he featured in seven of Brazil's eight matches and scored twice, catching the eye of several European clubs including Chelsea and Atletico Madrid.
Chelsea's interest has already translated into concrete action. The Premier League club tested Cruzeiro's resolve earlier this year with a €10m (£8.6m) bid, only for the Brazilian side to knock it back and instead tie their midfielder down to a new contract until 2029, complete with a €100m (£86m) release clause for clubs from outside Brazil.
That release clause remains unchanged, but Morais continues to build the case for why Chelsea moved so early. Deployed in the position usually filled by Matheus Pereira, he looked composed in possession before capping his display with a well-struck finish from outside the box.
Morais has progressed steadily through Cruzeiro's academy since joining in 2017, and his rise has accelerated since his performances on the international stage last year.
The Under-17 World Cup remains the moment his profile shifted from domestic prospect to genuine European target, with scouts from multiple leagues said to be tracking him throughout the tournament.
Cruzeiro's decision to reject Chelsea's opening approach and instead extend his contract reflects the value the club place on their prospect, with the €100m release clause designed to discourage anything but a serious, big-money offer from abroad.
A senior debut goal, however brief the sample, will do nothing to soften that stance. If anything, performances like the one against Defensor make it more likely other clubs beyond Chelsea and Atletico Madrid begin monitoring his situation too.
For now, there is no suggestion of an imminent move, with Morais expected to continue his development in Brazilian football for some time yet. But for Chelsea's recruitment staff, his senior bow will be seen as further vindication of work done well before most rivals were paying attention.