Joy for Olympique Marseille who condemned Inter Milan to their sixth defeat in seven games heaping the pressure on beleaguered coach Claudio Ranieri [GETTY]

Unheralded Swiss side FC Basel added Bayern Munich to their list of European Champions League conquests on Wednesday, beating the four-time European champions 1-0.

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.

Marseille also scored late for a 1-0 home win, Andre Ayew heading in an injury-time goal against 2010 winners Inter Milan.

The second legs of both matches are scheduled for March 13.

Fighting spirit

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 stages, 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.

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 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.

Last-gasp

A badly out-of-form Inter side looked to have done enough to secure a draw in France, but Ghana striker Ayew timed his run perfectly to meet a corner kick in the third minute of injury time and head the ball firmly past goalkeeper Julio Cesar's outstretched hand.

The goal sealed Inter's sixth defeat in seven games and increased the pressure on already beleaguered coach Claudio Ranieri.

Uruguay striker Diego Forlan had Inter's best opportunity early at Stade Velodrome when he forced goalkeeper Steve Mandanda to tip the ball over the bar from close range.

Ranieri left striker Diego Milito on the bench even though the Argentina is Inter's leading scorer with 12 league goals and is the only player to have scored for the club in their miserable seven-game spell.

Marseille, meanwhile, extended their unbeaten run to 16 games.

Wednesday's matches were the last of the eight first-leg games in the round of 16 to be completed.

The second-leg matches kick off in two weeks, with Arsenal hosting AC Milan and Benfica hosting Zenit St. Petersburg on Tuesday. APOEL hosts Lyon and defending champion Barcelona hosts Bayer Leverkusen on Wednesday.