Kepa Arrizabalaga is confident he and Chelsea’s other Champions League rookies can flourish in the competition this season. Kepa, Tammy Abraham, Mason Mount and Fikayo Tomori are all set for their debuts among Europe’s elite when they face Valencia at Stamford Bridge on Tuesday night. It might be a step into the unknown for Chelsea’s young team but Kepa feels the “energy” and “enthusiasm” they demonstrated in winning 5-2 at Wolves on Saturday will serve them well. The 24-year-old Spain goalkeeper said: “Regardless of the fact we’re a young team and it’s only September and there is a long way to go, we are going to play with energy and try and attack the opposition. “Many of the players in the team will be playing their first Champions League game but we’ve been waiting for this for a long time. “We spent the whole of last year trying to qualify for the Champions League so we feel very enthusiastic. “We can’t wait to see the atmosphere at the Bridge and play in front of our fans in the most important European club competition.” Boss Frank Lampard, another debutant as a manager in Europe, feels his side have what it takes…