Did I watch a different game than the rest of you? From what I could see, the only things Tello did well today was keep width, which isn't exactly rocket science, and make two or three good runs behind Arbeloa. Past that, what did he do to impress? He was beaten by Arbeloa in every 1v1, had absolutely no idea what to when he actually got the ball near the edge of the box, wasted several VERY good scoring opportunities, and gave away the ball that lead to Madrid's winning goal (Messi was reamed for this against Chelsea).
Look, the kid has a great future and anyone who blames him alone for losing this game or la liga is overreacting, but he was awful today, worst performance I've seen from a Barca player in recent memory. Pep showed too much confidence in him today by keeping him on the field for 80 minutes.