Celtic will always be on the lookout for bargains in the transfer market as Brendan Rodgers looks to build a team capable of conquering all domestically. Success in Europe would also be excellent, but that isn’t to say that you can’t achieve stardom without spending tens of millions. There is a compromise to be found if the club look hard enough. The summer transfer window came and went, leaving Celtic with a first-team squad packed full of talent while retaining squad depth in each position. Looking ahead to January, the mid-season market is usually about topping that up and compensating for …