Manchester United will be favourites to come out on top against Olympiakos in the first leg of the Champions League last-16 tie in Greece tonight.
The Red Devils have a flawless record against the Greek side, winning each of the last four meetings, while scoring 12 goals and conceding a grand total of two in the process.
However, United's former shot-stopper and current Olympiakos player Roy Carroll smells blood - and believes his team can put a dent in the Red Devils' record thanks to their shaky defence.
"They look nervous," Carroll told BBC Sport. "Every time you watch them this season you just feel that the opposition will score. It's weird - you don't associate that with Manchester United.
"We are hoping to keep a clean sheet at home in the first leg and if we can do that we back ourselves to score at Old Trafford. We have been working on United's defensive problems in recent days; that's what we have to do."
Olympiakos are the reigning Champions in the Greek Super League and they currently sit top of the table this season, 20 points clear of Paok Solonika, thanks to 24 wins from 26 games(two draws).
Their scoring spree (78 goals) has played a huge part in creating the gigantic lead but they lost leading scorer Kostas Mitroglou to English Premier League side Fulham in the January transfer window.
Nevertheless, 21-year-old Michael Olaitan has filled in nicely following the Greek International's departure, finding the net seven times in 10 games in 2014. He will no doubt be one of the threats Manchester United look to contain tonight.
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