Everton have failed to score in their last two league games, despite creating plenty of openings.
As a result, manager Martinez has had to settle for three Premier League draws to start his reign, when he feels he could have had three victories.
He refuses to pin the blame on Jelavic, and believes that the striker will come good.
“He has been in the right frame of mind. He’s been working extremely hard for the team, Martinez said.
“I don’t think it comes down to one individual. In the three league games we’ve played already, we’ve done enough to win them.
“The difference is that we haven’t been able to score goals. I don’t think that responsibility should come down to one player.
“I do feel that Niki has been working really, really hard. We’ve created enough chances, and he’s been pivotal in that. He’s created a lot in front of goal.
“We probably need to find that final pass and show a bit more composure in front of goal. And we need to score more goals. The way that we control games, it’s fair to say that we need more goals.
“We need to realise that you shouldn’t need so many chances to score a goal. When you don’t score goals, the first question is: Do you create enough?
“Clearly then, it becomes a big problem. If you don’t have the way of playing where you get in the final third of the field with real threat, that’s a problem. But that hasn’t been the case.
“If you look at the number of corners and good opportunities that we’ve had, it’s clear that it’s just a matter of working at that play in the final third.”