Rangers have been urged to step up reported interest in 17-year-old Motherwell talent Lennon Miller before it’s too late. The Ibrox side were one of a whole host of clubs linked to Lennon Miller in November, with Old Firm rivals Celtic and a number of Premier League sides also mentioned. Now, after Miller played his role in an impressive first-half Motherwell performance v Celtic, Charlie Mulgrew has urged either side of the Old Firm to get in now before it’s too late. Charlie Mulgrew urges Rangers to sign Lennon MillerSpeaking after the game, Charlie Mulgrew told the Sky Sports panel that eit…