Martinez insists there is more to come from the midfielder, who the Blues boss says is still finding his feet in English football.
"Muhamed is still a player that is shaping up his qualities," Martinez told evertonfc.com. "In Germany, with Hamburg, he played in different positions. He played as a centre half and when he went to Ferencvaros that is the position that he excelled in.
"Obviously playing for Bosnia, he started to use his quality a little bit further forward in front of the back four. It transformed his position on the pitch and, since coming here, he has taken massive strides in improving his tactical awareness.
"Something he will never be short of is technical ability, ball control and his passing range. They are aspects that are fitting in well with where he is developing in our team.
"He is still very young in terms of the position he is playing so I am very much looking forward to his full development and seeing how quickly he can get to the best possible level."
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