Newcastle United are open for business on transfer deadline day, as they aim to give Eddie Howe’s squad one last boost before the window slams shut. However, Newcastle United‘s major deal is unlikely to be completed. Thursday brought news that Newcastle are walking away from the Marc Guehi deal, with Paul Mitchell unable to agree a fee with Crystal Palace. The Guehi situation has been extremely frustrating, and it has now culminated in an uncomfortable final day of the transfer window for Toon fans. Newcastle are willing to do business on deadline day, but only if the right deals come up. Ther…