Barcelona coach Hansi Flick says teenage winger Lamine Yamal is returning to his "top level" ahead of Monday's La Liga clash against Rayo Vallecano. The 19-year-old struggled in the club's opening match of the season against Elche but showed improvement over 90 minutes in the second game against Athletic Bilbao, despite failing to score. Flick attributed the slow start to a hamstring injury Yamal suffered in April and the demands of the FIFA World Cup, saying the player needed time to rebuild match sharpness after only three weeks of holiday.