Getty ImagesRitabrata BanerjeeWatch out Arsenal! Newcastle join race to land £70m-rated Ousmane Diomande from Sporting in January transfer windowArsenalNewcastleOusmane DiomandeTransfersPremier LeagueSporting CPNewcastle United are reportedly set to compete with Arsenal for the signing of Sporting defender Ousmane Diomande in January.Article continues belowArticle continues belowArticle continues belowNewcastle enter race to sign DiomandeSent scouts to Sporting's clash against BenficaArsenal placed a bid in SeptemberArticle continues below