London:Olympiakos of Greece need to win away to Manchester United in the Champions League on Tuesday to have any chance of remaining in the competition. But their coach has not ruled out that possibility, while the home side will be hoping to put behind an unusual run of two successive home defeats. The Greek side will be looking for revenge against United after the English champions ended the Greek side's home record of 13 games without a loss in the first leg between the two teams two weeks ago. Manchester had won that game 2-0. But it's a different story now with United losing two successive games at home. Spanish side Deportivo La Coruna first beat them last Wednesday, who are the current Group G leaders. And the other came at the hands of Bolton Wanderers in the English Premiership over the weekend. United though can take heart from the fact that Olympiakos have never won an away game in the competition. In addition, the Greek champions have lost all three of their previous matches in England. In addition, United know a win for them here would virtually seal their place in the second stage. In Group F, Barcelona travels to Olympique Lyon. The Spanish side would not be too happy with their form after they only managed a draw against Malaga in the La Liga over the weekend. Defending champion Bayern Munich play host to Feyenoord. The German side knows it has a tough game in hand, after they could only manage a draw in the first leg. They know they need just a draw to confirm their place in the second stage.