The 25-year-old had been a free agent since leaving Shakhtar Donestk at the end of last season and was inundated with offers, particularly from the Premier League.
Everton's season-long loan deal for Portugal's Gomes will see them pay 2.25 million euros (RM10.6 million) and the player's wages.
Mina had been strongly linked with a move to Manchester United following an impressive 2018 World Cup with Colombia, but Everton secured his signature.
"It's important the club want to fight for something". The France global, who spent last season on loan at Stoke City, had also been linked with Old Trafford but was in line to become Everton's fourth recruit of the day after paperwork was submitted moments before the 5pm deadline.
The Catalan club have included a buy-back clause in the deal with the Toffees.
"The manager made me feel confident about playing here". He is a very good coach and he has achieved really good things at other clubs.
Moments later they also confirmed that Portugal worldwide Gomes would join the Premier League side on loan. "This is a great opportunity for me", said Mina.
I spoke to Lucas and he told me all about the Club, which also made me keen to come here'. I know about Everton's players and I look forward to being able to play with my new team.
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