The Brazilian signed from Watford in a mega deal earlier this summer.
For the first time, the Premier League deadline was moved forward to the day before the season kicks off when United host Leicester City on Friday.
Everton have announced that Mina will be No 13 while Andre Gomes will be No 8.
Barca have inserted a buy-back option for the Colombian global, who caught the eye after a series of impressive performances at the Russia World Cup.
In the meantime, Everton will pay the Catalans 30.2 million, plus 2.2 in variables for the Colombian's services.
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"I worked hard during my holiday and now I am ready to play and do important things with the Club".
Brighton and Hove Albion secured defensive reinforcement in the shape of former Barcelona right-back Martin Montoya, who joins from Valencia on a four-year deal. He has made just six appearances during his time in Spain.
The fee for Mina, who only joined the Spanish champions in January, could rise by 1.5 million euros and Barcelona have inserted a buy-back clause in the player's contract.
"Everton is historically the fourth most successful club in England", said Bernard. "I am also determined to do my best for Everton".
'The manager made me feel confident I wanted to play here because of what he's done in the past.
Portuguese midfielder Gomes is also set to swap the Nou Camp for Goodison as part of a season-long loan deal where he will link up with compatriot Silva.