London: Unheralded Swiss side FC Basel added Bayern Munich to their list of Champions League conquests Wednesday, beating the four-time European champions 1-0 in the first leg.Having beaten Manchester United in the group stage to reach the second round, Basel twice hit the frame of the goal before substitute Valentin Stocker hit an 86th-minute shot through goalkeeper Manuel Neuer's legs.Bayern are in a poor run of form that has dropped them to third in the German league. That run now threatens their involvement in Europe's premier club competition and â unlike when United were knocked out of the group stage â there is no consolation of a Europa League place if they are eliminated.The May 19 final is set to be held at Bayern's Allianz Arena."The alarm bells are going to be ringing," Bayern coach Jupp Heynckes said. "We're not in an ideal position for the return game. We need to start winning."Basel showed the same fearlessness that helped them to a 3-3 draw and then a 2-1 win over Manchester United in the group stage, threatening Bayern's goal and giving their opponent several chances on their own.Basel goalkeeper Yann Sommer made a string of saves at noisy St. Jakob Park stadium, starting early with a close-range block against France winger Franck Ribery.Sommer denied Ribery again with a diving save in the 11th before, with Bayern missing injured midfielder Bastian Schweinsteiger, momentum switched and Neuer was forced into action."We had two huge chances early on," Heynckes said. "It's important to take those chances so you can be relaxed approaching the rest of the game."Neuer tipped away a flick by Marco Streller, pushed Aleksandar Dragovic's header against the post and, after Basel forward Alex Frei swept a left-footed shot from 10 meters (yards) against the bar, saved a long-range effort by Shaqiri.Shaqiri is set to join Bayern in the Bundesliga next season in a reported $15.3 million transfer.Jacques Zoua, on as an 83rd-minute replacement for Shaqiri, set up Stocker for the winning goal.