Naismith has described the Croatian as a mix between ex-‘Gers strikers Kenny Miller and Kris Boyd and admits that the team expects him to score in every game.
Jelavic has been impressive in his first season in Scotland, scoring 11 times in 16 appearances, and his performances have attracted plenty of positive comments from those involved with him at Ibrox.
"Now that Jela is fit he's showing everyone what a player he is,” Naismith said.
"He's like a combination of Kenny and Kris.
"He has more of a physical presence than Kenny had, but he's also tremendous with the ball at his feet, he's just a great player.
"We now start every match expecting him to score and if he isn't among the goals himself then he's setting them up.
"The hardest thing a footballer can do is to get a bad injury during the season and then come back into the side after a lay-off, but he's done that.
"He's up there with the best I've ever played with.
"Kenny was great to play alongside and I also had a really good partnership with Boydy, especially when we were at Kilmarnock.
"Nikica is quite similar to Kenny in his hold-up play and bringing other team-mates into the game.”