Rangers manager Mark Warburton hailed Kenny Miller's off-the-field approach after the 37-year-old scored two late goals to come to his side's rescue against Motherwell in the Scottish Cup.

Louis Moult's opener looked set to send the Ibrox club out of the competition at the fourth round stage, only for Miller to find the net in the 85th and 89th minute.

Warburton gushed with praise for the veteran striker, highlighting his professional approach.

He said: "We see it week in, week out. It was two quality finishes, a great ball in from Waggy and then the composure and the poise from Kenny.

"The second is a great ball in from Emerson and he finishes it with aplomb so it is no coincidence. It is the way he works on the training field, the way he eats. It is all credit to him and the senior players."

Gers laboured through the opening 75 minutes of the game and only sparked into life after Moult struck. But Warburton felt his side merited victory all the same.

"I'm delighted we're through," said the Englishman, who felt his side should have had a first-half penalty when Michael O'Halloran was tripped by Stevie Hammell.

"I thought we deserved to win the game of football but you find yourself 1-0 down with 15 minutes to go so that is the harsh reality of it.

"The positives were we passed the ball well. But we never penetrated, we never tested their keeper and we didn't have enough bravery in the final third.

"All credit to Motherwell - they were very hard working, very well organised and well marshalled. Our goals came late because that is when their players tire. Again two late goals is credit to our team, to their fitness and their desire."