Celtic fans are waiting on tenterhooks to hear if Matt O’Riley will stay at the club for another year following intense speculation surrounding his future this summer. Atalanta have been at the forefront of the pursuit for his signature. The Europa League winners have seen several bids turned down for O’Riley as they are yet to meet the Bhoys’ valuation. Brighton & Hove Albion have also been mentioned as suitors for the Denmark international. However, with Brajan Gruda now in the door from Mainz, their admiration appears to have faded. Southampton manager Russell Martin also confirmed that his…