Kris Boyd reckons his former team would face a serious challenge in replacing their "best player" Alfredo Morelos - if he departs this summer.
revealed Lille are readying a £17m move for the Colombia international with West Brom also keeping close tabs on the Ibrox talisman.
Boyd admits the 24-year-old leaving Rangers would be a blow and reckons any exit is compounded by Celtic's winning transfer formula.
The Premiership champions have perfected the art of selling their best players for big money over the past decade with Kieran Tierney, Virgil van Dijk and Moussa Dembele all exiting in money-spinning deals.And Boyd concedes the Hoops' transfer touch could once again prove its worth as they eye a 10th consecutive title.
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