Martinez said: “With Mason, an opportunity came up and we didn’t want to lose out. He is a young man with a very impressive future. He is not a player who I would expect to perform straightaway in the Premier League - that would be very unfair.
“Mason, already at 18, has played 20 games in League One, which shows his incredible potential. I feel that we are the perfect place in order for Mason to develop into a top footballer. I know that he is a player who can bring us something quite unique, so we are excited about that possibility, even though he is one for the future rather than now.”
Holgate, 18, is a right-back who is considered one of the brightest talents in English football. He only made his debut last December for Barnsley, but had already appeared 22 times for the club prior to his exit this summer.
However, Martinez has admitted that he does not expect Holgate to immediately move into his Premier League squad - despite his experience in League One.
Seamus Coleman is current first choice right-back at Goodison Park, and it would take a world class player to dislodge him from Martinez’s plans. However, there is a lack of cover in the defensive positions, and Holgate could be used as back-up to Coleman.
He is also likely to be utilised in lower league cup ties, and should end the 2015/16 campaign with a handful of first-team appearances to his name.
Holgate is highly rated, and clearly Martinez is a big fan of the youngster as he signed him, but this year will be nothing more than a chance to develop into a Premier League player, and Everton fans should not be expecting too much of their new signing.