Manchester United legend Paddy Crerand believes they can still reach the Champions League quarterfinals.
United must overcome a 2-0 deficit in the second-leg of their tie with Olympiacos.
"We've been fantastic in Europe and our better football has been played away, while we've struggled at home," the Scot told MUTV.
"Now we've got a big, big match coming up at Old Trafford. It's the big one because we're in a situation where qualifying for Europe through the league is looking distant, so it's important that United do something at home against Olympiacos."
