Everton have tabled a new deal to Luke Garbutt.
The Liverpool Echo says the 21-year-old left-back is out of contract in the summer and talks have been ongoing between his representatives and the club.
However, with nothing settled, Everton officials are becoming increasingly concerned over the situation.
It is believed that Everton have offered the former Leeds United youngster fresh terms and that Martinez is keen for the England under-21 international to remain at the club.
