Eddie Howe has overseen a dramatic improvement in the Magpies’ fortunes since the Saudi Arabian investment arrived at St. James’ Park
The gross spend was 90 per cent higher than the previous record of £430m in 2018 and almost triple the previous January window (£295m).
The 21-year-old midfielder joined from Standard Liege for an "undisclosed fee on a long-term contract, subject to a work permit being confirmed" to become Michael Beale's second signing after Todd Cantwell. Celtic manager Ange Postecoglou earlier ruled out any deadline-day signings and Oliver Abildgaard proved to be the only departure before midnight with the Danish midfielder joining Hellas Verona following nine substitute appearances for the Hoops. Giorgos Giakoumakis was still officially a Celtic player at midnight but he is expected to join Major League Soccer side Atlanta United, whose transfer window opened on Tuesday and runs until April 24.