The club had already made a major breakthrough in negotiations for Hassan after weeks of talks with Real Oviedo. Who should Celtic sign after the Hassan deal is done? Haissem Hassan completes medical ahead of Celtic moveThe latest update from Anthony Joseph on Hassan’s transfer says the 24-year-old has completed his Celtic medical in London. MORE CELTIC STORIESIt comes after the Hoops moved ahead of competition for Hassan earlier in the window. But with the medical finished and Hassan now expected in Glasgow to sign the paperwork, very little appears to be left to sort.