Mark Warburton: age no barrier for veteran Rangers striker Kenny Miller

Mark Warburton has backed Kenny Miller to continue playing into his 40s after watching the veteran striker bury his 100th Rangers goal.

Miller - who turns 37 two days before Christmas - volleyed home his landmark strike to hand the Ibrox side a 1-0 victory over Inverness in the Highlands.

And his manager reckons his professional approach could see him emulate assistant boss David Weir, who was 41 before he hung up his boots.

Warburton said: It was a tremendous finish from Kenny.

How Kenny trains, how he conducts himself, how he looks after himself, his mentoring role with the younger players on and off the pitch and the respect he has in the dressing room is all very important.

With people like Kenny, like Lee Wallace, like Niko Kranjcar, they have an important role to play.

Kenny knows what we think of him, his contribution, another 90 minutes tonight, tells you all you need to know.

How long can he keep going? Ask Davie Weir. He looks after himself very well. He deserves to keep going.''

Gers put on one of their best displays of a troubled campaign so far but even then could only maintain the pace and tempo Warburton has been demanding for 60 minutes.

It was enough to seal victory though, with Miller lashing home a sumptuous volley from Wallace's cross after 22 minutes.

Inverness came back into the match in the latter stages and should have grabbed a leveller when Liam Polworth released substitute Aaron Doran with 17 minutes left.

But the Irishman's shot was weak and Clint Hill was able to clear off the line.

It's a tough place to come,'' said Warburton, who revealed Danny Wilson will be fit to face Celtic next week despite missing this match with a thigh strain.

We played very well in the first half. We were brave and patient and I was very happy at half-time.

But we gave them too many chances in the second half with us being loose in dangerous areas. We need to tighten up on that.

There is room for improvements but there are still lots of positives.''

Caley Thistle boss Richie Foran felt his side deserved more than a defeat.

He said: You have to stick the ball in the net. We had enough opportunities tonight.

I'm disappointed for the lads as it was a real high tempo game and they gave their all.''