Sunderland confirmed yesterday that Callum Styles has returned to Barnsley following his loan spell with the club. The midfielder joined Sunderland on loan in the January transfer window with the option to buy him this summer. After being sidelined for the first four matches of his time on Wearside, Styles was brought into play primarily as a left wing-back due to the club’s extensive injury list. The Hungary international made 10 starts for the Black Cats, and while he improved towards the end of the season, he often came under heavy criticism for his performances. Styles was slammed for caus…