Galloway had shown signs of potential at development level as a youngster, and Martinez has had high hopes for the defender since watching his talents.
The Spanish boss has been proven right in his confidence over Galloway’s ability, with the youngster excelling in the senior side this season.
And Martinez believes that being brave with their youngsters, will be crucial to any success Everton might have in the future.
“There are two major pillars in our strategy and vision,” he said. "One is making brave decisions to make sure young talent has a big role at the club and the second one is having continuity to ensure we can work on a daily basis to build something special.
“Everybody can speak about young players, but the key is how important they are to the team.
“We have got players like Ross Barkley, Romelu Lukaku and John Stones who we knew would benefit from the challenging season we had last year and also the special time we had in Europe.
“Then we have got Brendan Galloway, who is an example of the elite group we have been investing a lot of time in over two years. And there is also Gerard Deulofeu, who we felt was coming home.”
Everton have assembled one of the youngest squads in the Premier League, but their inexperience has not hampered them this season.
The Toffees have been in impressive form since the start of the campaign, and they appear to have the potential to make it into Europe.
At the moment, Everton are in seventh place in the Premier League table, with their next match coming against struggling Bournemouth.