Jelavic has fallen out of favour at Goodison Park this season, and has yet to find the net in eight appearances for Martinez's men.
|14/1||Everton are 14/1 with BetVictor to sign Tom Ince in January|
"We've had a couple of enquiries from two different clubs for one of our players," Martinez told the club's official website.
"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 [against Southampton].
"Whatever happens in January will be for the good of the football club and that's where the work is."