The Gers will take on Old Firm rivals Celtic in the semi-finals of the Scottish Cup this season.
One of the senior and most experienced players in the current Rangers squad is Miller, who is in his third spell at Ibrox.
The Scotsman, a former Celtic striker, seems to be setting an example to the younger players in the team.
When asked about Miller’s importance in Rangers’ preparation for the Celtic game, manager Warburton told talkSPORT: “He is vitally important. I think sometimes people talk about the older players, and they use words like experience and maturity, but Kenny trains every day the best he can be.
“He is a fantastic example. The young loan players from Arsenal and Tottenham always refer to the example that he sets. He looks after himself, he is in great shape."
“Our job is to make sure that the load on Kenny is right because games do come thick and fast at this stage of the season, but I can’t speak highly enough of Kenny Miller,” added Warburton.
It seems that Arsenal-owned midfielder Gedion Zelalem and Tottenham Hotspur-owned defender Dominic Ball are following Miller’s example at Rangers.
Miller is a vital player for Rangers, and he will be looking to explain to his teammates how to deal with the Old Firm derby.
Rangers are at the top of the Scottish Championship table at the moment with 69 points from 27 matches. The Glasgow giants are 12 points clear of second-placed Falkirk and have a game in hand.