A goal deep in injury time by Ghanaian star Andre Ayew gave Marseille a 1-0 win over 2010 champions Inter Milan in their Champions League last 16 first leg and cast further doubt over Claudio Ranieri's future on Wednesday.

There was also a late goal in the night's other tie as substitute Valentin Stocker's 86th minute effort gave unheralded Swiss side Basel a shock 1-0 home win over German giants Bayern Munich.

It continued a worrying slump in Bayern's fortunes which has seen the four-time European champions win just three of their last seven games.

Basel's win saw them become only the fifth team in the competition's history to beat both the German side and Manchester United in the same campaign - four of them went on to win the trophy.

"It was a very difficult game, Bayern made us run a lot," said Basel's keeper Yann Sommer.

"We have beaten two of the best teams in the world here now - Manchester United, from whom we took four points in total, and Bayern which is unbelievable for a Swiss team.

"But we are a good side and we believe in ourselves so I don't think Bayern underestimated us."

His Bayern counterpart Manuel Neuer conceded that they had not deserved much from the match and their problems needed fixing quickly.

"We didn't play well and didn't take our chances. We have to deal with this internally now and fix the problems quickly."

Marseille and Inter failed to deliver much in the sense of entertainment until Ayew's goal in the third minute of injury time gave the 1993 champions some breathing space when they travel to Milan.

"We showed desire and determination," said Marseille coach Didier Deschamps, who captained the 1993 side.

"It was good for us to score at the end, because it could have been a draw.

"If we don't concede in the return leg, we'll go through, but that won't be enough. We'll try to score a goal, but in any case it will be a complicated match."

Ranieri remained defiant both about his own position as well as his side reaching the last eight.

"We played a good match, in which we created more chances than them, and we didn't deserve to leave beaten," he said.

"It's a shame to concede a goal from one of their only chances, but the match isn't over. There are still 90 minutes to go and, with a full stadium, a turnaround is possible."