The 33-year-old is one of several new faces in Mark Warburton's Glasgow Rangers squad.
The midfielder rejected the chance to return to the Premier League with Burnley in favour of becoming a part of the squad that Mark Warburton will be hoping to lead back towards the top of the Scottish Premiership.
But despite the opportunity that staying at Turf Moor would have presented, Miller claims that he did not need to do much to twist the 33-year-old's arm regarding a move to Ibrox when he spoke to him a couple of days before the move was completed.
"No to be honest I don't think I needed to [convince him]. He seemed keen, was asking a lot of questions," he told the Evening Times.
"Not only about the football side but about the club in general. The backroom staff, everything about the place."
Miller's opinion of Barton's desire to join the Light Blues arguably proves that he plans to play a key role in guiding the Gers back toward the summit of the table.
If he had been motivated by financial gain, then he would have surely found it much more difficult to turn down the potential riches of the English top flight.
However, Miller's comments suggest that his mind was practically made up, which arguably proves that he is almost solely focused on winning trophies and helping re-establish Rangers as a force of Scottish football once again.