Chelsea boss Thomas Tuchel said reaching the last four of the Champions League is a "great achievement" as the Blues moved into the semi-finals for the first time since 2014.
"We will become a strong side," he told BT Sport after his team lost the second leg 1-0 in injury time.
"We could not finish it off with a goal so we had to hang in there."
Chelsea were ninth in the Premier League when Tuchel arrived in January but he has guided them to within a point of the top four, the FA Cup semi-finals and now into a Champions League semi-final despite Mehdi Taremi's superb late winner in Seville, which hosted both legs of the tie because of coronavirus restrictions.