The 18-year old Anderlecht striker is reportedly on the verge of joining the Toffees and Martinez is looking forward to bringing the talented attacker to Goodison Park in the very near future.
"David is a young man who is someone with a very good future and we want him to be part of our development squad and get into the Under-21s," Martinez told the club's official website.
"He's had a rapid rise in his early years. He's only 18 and has attracted a lot of attention, but we need to give him a bit of quiet time to allow him to work on his game and develop as a footballer.
"He has real talent with a view of one day making it into the first team, but that will be down to him and his hard work."
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