The arrival of Arturo Vidal from Bayern Munich further limited his chances of featuring for the Catalan based club.
Mina had always been linked with a move away from Barcelona this summer with the club's purchases of non-EU players in Malcom, Arthur and Arturo Vidal filling their quote per La Liga's rules.
Barca have inserted a buy-back option for the Colombian worldwide, who caught the eye after a series of impressive performances at the Russia World Cup. He will compete for places with Gylfi Sigurdsson, Morgan Schneiderlin and Tom Davis.
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"It is important that the club want to fight for something".
'I have watched the Premier League for a long time. Everton agreed a €2.25m (£2.02m) loan fee for the 25-year-old, who now has a minor injury but passed a medical held in Barcelona, and will pay his wages in full for the season.
'The manager made me feel confident I wanted to play here because of what he's done in the past.
Mina has signed on a permanent five-year deal worth €30million (approx £27.2million), while Portugal global Gomes has arrived at Goodison on a one-season loan.