Former Manchester City stars Ilkay Gundogan and Riyad Mahrez reunited last night, as they posed for a photograph after Barcelona’s Champions League win over Paris Saint-Germain. Both players left the Etihad Stadium last summer, having played key roles for Manchester City en route to the Treble win. Gundogan left at the end of his contract, and joined Barcelona on a free transfer, while Mahrez completed a move to Saudi club Al Ahli, who paid around £30 million for his signature. A contract offer was supposedly made to Gundogan, but the midfield maestro did not deem it acceptable and therefore c…