Mikel Arteta has urged Myles Lewis-Skelly to "learn his lesson" and avoid becoming a "liability" again at left-back following his first-half substitution in Tuesday's 7-1 thrashing of PSV Eindhoven.

Mikel Arteta has said that Myles Lewis-Skelly must learn to navigate the fine margins of elite football, with the Arsenal manager offering his support as the teenager looks to move past a growing ...