Celtic have endured a frustrating time of things in the transfer market since Brendan Rodgers returned to Parkhead last summer. All too often, the Bhoys’ squad has resembled a group that is full of quantity; however, the ‘quality’ that Rodgers has repeatedly asked for hasn’t been present on too many occasions. The Irishman indicated back in December that his ideal number of players to work with would sit at around the 25-man mark. He elaborated, stating: “Ideally we’d have a squad of 25 players, 22 with three goalkeepers. In which case, there will also be an opportunity for young players to co…