Jelavic moved to Goodison Park from Rangers during the 2012 January transfer window and enjoyed a blistering start to his Everton career by scoring nine goals in 13 appearances.
However, he mustered just seven goals in 37 Premier League games last season and has yet to open his account from eight outings this term.
The Croatia international has not started a game since mid-September and has been forced to provide the back-up to summer signing Romelu Lukaku in recent months.
West Ham United have been linked with a loan approach for Jelavic in the New Year and Martinez acknowledged there has been interest in the 28-year-old.
With Jelavic keen for playing time ahead of the World Cup finals, Martinez is now considering what would be best for both the player and Everton.
Speaking ahead of Sunday's game against Southampton, he told evertontv: "We've had a couple of enquiries from two different clubs for one of our players.
"Nikica Jelavic is someone who we have made it very clear to - we've had a conversation and he has the World Cup around the corner.
"He needs to be playing minutes and we understand that. We'll always try to give it a good assessment of the situation but that's not affecting anyone at the club.
"All we are focusing on is being as good as we can on Sunday.
"Whatever happens in January will be for the good of the football club and that's where the work is."