Celtic have submitted an opening offer worth around £6 million for the winger, with performance-related add-ons potentially increasing the total package to nearly £10 million.
While the two clubs are yet to reach a full agreement, sources close to Celtic remain optimistic that a deal can be finalized after ongoing negotiations.
The Scottish champions have been in discussions with the Spanish side for several weeks, having stepped up their interest after Hassan caught the eye with his performances for Egypt at the World Cup.
The 24-year-old featured 38 times for Real Oviedo last season, registering three assists while operating primarily on the right flank.
If the move is completed, Hassan would become Celtic’s third signing of the summer, following the arrivals of Camilo Duran and club-record acquisition Kasper Høgh.
Manager Martin O’Neill has made it clear he is eager to strengthen his squad further before Celtic’s upcoming Champions League qualifying clash with Austrian champions LASK.
