Former Manchester United goalkeeper Roy Carroll believes that the Red Devils 'lack fight' this season.
United lost 2-0 to Olympiakos in a pitiful display in Greece and face a tough task of progressing to the Champions League quarter-finals, despite having home advantage for the second leg of their last-16 tie.
Carroll, who currently plays for Olympiakos, told Sky Sports: "(The win) was a shock for a lot of press people but the players knew themselves they had a chance."
"They've got good players but they had no hunger, no fight in the team so it was a shock in that way but not a shock the way we played. The goals we got were well deserved.
"We watched a lot of Premier League games this season and knew United had not been performing. On the night when I was watching it live from the stands, I've never seen a Manchester United team like it."
United have endured a miserable season so far under new manager David Moyes. They have been knocked out of all domestic cups and sit seventh in the Premier League, struggling to retain Champions League qualification for next term.
Carroll made 68 starts for the Red Devil's between 2001 and 2005, during which time they won two Premier League titles and an FA Cup, but the ex-United man believes his former side lacked urgency in Athens above all else.
He said: "At the end of the day you can be a good player but you have to give 100 per cent and give everything. For me Manchester United didn't give that and looked like they had no hunger and fight for the game."
"I don't know if they thought they would get an easy game but no professional should go into a football match and think that."
United will face Olympiakos at Old Trafford on the 19th of March, where they will have to overcome a two-goal deficit in order to progress to the Champions League quarter-finals.
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