John Hartson says he expects Celtic to make multiple signings before the transfer window closes if Matt O’Riley officially leaves to join Brighton. Speculation ramped up this week about O’Riley’s possible Celtic departure after Brighton boss, Fabian Hurzeler was quizzed about the Dane. And after Fabrizio Romano posted on social media this week that the deal for O’Riley was close to completion after Celtic and Brighton agreed on a fee for the 23-year-old midfielder, it seems like it’s just a matter of time now before the transfer is made official. And when the deal is done, John Hartson has sha…