Stephen McManus says Celtic can get a result at Old Trafford despite their dismal European away record.
The Bhoys' hopes of progressing have suffered early blows after following up their goalless home draw with Aalborg with a 1-0 defeat to Villarreal in midweek.
"All the players are devastated but none of us believe the campaign is lost," said McManus in the Daily Record.
"Yes, we have to go to Old Trafford next and that will be a tough game. But we can go there with some confidence.
"We played well when we went down there the last time and only lost 3-2. We also felt we played well in Villarreal for a long time.
"We have taken just one point from our first two games but we will go to Old Trafford looking for a result.
"United are a better team now then when we played them a couple of years ago. But it is a challenge we are happy to take on."