ADAM MATTHEWS
Made over 40 appearances in the league winning season and seemed destined for great things, at Celtic or elsewhere.
The arrival of Mikael Lustig provided competition but the Swede took charge with Matthews leaving in 2015 with four title medals.
Moving to Sunderland has proved to be a disaster with more time spent on loan at Bristol City, this year will be a crossroads for his career, at 25 years of age he should be getting close to his prime