One other player that the Parkhead club cashed in on that has proved to have been a great call from the Hoops is Adam Matthews.
In those appearances, the £17k-per-week right-back scored five goals and delivered 22 assists before joining Sunderland in the 2015 summer window.
Sold for a reported fee of £2m, the Hoops made a significant profit on the player after four years of service at Celtic Park.
According to Transfermarkt, the full-back is currently valued at £540k, which is not only significantly lower than the transfer fee that Celtic picked up for him but also lower than the value of £2.7m that he was rated at during his days with the Hoops.
This season has seen Matthews play in 26 League One games for the Addicks but only earn himself a rather uninspiring overall performance rating of 6.53/10 from WhoScored.
To further highlight how disappointing he’s been in this campaign, the Wales international has only been able to average 0.7 tackles and interceptions per game, which is rather unimpressive for a defender.
Taking all of this into account, it’s safe to say that Celtic made the right call in cashing in on the player when they did, as his value has decreased with every season gone by.
Also, with Celtic currently having the best defensive record in the SPFL under Ange Postecoglou, it doesn’t seem likely that many Bhoys fans will have been wishing they still had Matthews in their side.