#4 Nelson Semedo
Nelson Semedo was chosen to start at the right back position and he had a stellar outing against a pacy Gunners side. The Portuguese made great use of his speed and skills to stay a step ahead of the opposition.
He was composed at the back, and adventurous in attack. Semedo formed a great understanding with Ousmane Dembele on the right, and the two of them regularly combined to cause the Arsenal defense trouble.
Whenever the Catalans had the ball, Semedo bombed forward without invitation. He was always available for a pass and was a tireless runner down the right hand side.
He probably needs to work on his final ball, but the lack of accuracy and precision is understandable in pre-season.
As Arsenal tried to catch the home side on the counter, Semedo's speed came in handy. The Portuguese religiously tracked back and shut the gate through his side of the pitch. Valverde should be pleased with his efforts.