Full-back Dalot, 19, signed a five-year deal at United. Dalot can play at right-back and left-back.
"Diogo is an extremely talented young defender with all the qualities to quickly become a great player for this club," United chief coach Jose Mourinho said.
"He has all the attributes that a full-back needs: physicality, tactical intelligence and technical quality, combined with a Porto Academy mentality which prepares players for the maturity they need at the professional level.
"In his age group, he is the best full-back in Europe and we all believe he has a bright future ahead of him at Manchester United."
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