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Former Manchester United goalkeeper Roy Carroll believes the club's fans may start to lose patience with David Moyes if they sense a trophy drought on the way.
Carroll, who played for United between 2001 and 2005, saw their struggles up close last week when his team Olympiacos beat Moyes' men 2-0.
– Roy Carroll on Moyes' woes
It surprised me a bit, the way Manchester United played against us because, for me, they are a team who want to win every game.
They haven't changed too many players from the side that won the league, but David Moyes has had a tough start.
He seems like a nice guy so I hope he does well, but the fans will have to be patient. I just don't know how patient United fans can be because they don't want to do an Arsenal and not win a trophy for that long, or be like Liverpool and go without winning the league for so many years.
Scotland midfielder Barry Bannan has hailed the return of "daddy of the team" Darren Fletcher ahead of the trip to Warsaw to play Poland.
Fletcher is back in the squad for the first time since November 2012 after battling back from a chronic bowel condition to return to the Manchester United team.
Manager Gordon Strachan is yet to confirm whether the 30-year-old will play in the friendly on Wednesday night or re-assume the captaincy from Scott Brown, but Bannan is delighted to have the team's natural leader back in the fold.
The Crystal Palace midfielder, speaking from Glasgow Airport ahead of the squad's departure, said:
– Crystal Palace midfielder Barry Bannan
He's like the daddy of the team. You look up to him because of what he has done and just to have him back is a big, big boost for the whole country.
I was young when I first broke through and he was one I was kind of in awe of and looked up to. He made it so easy for me. It's good to have him back. He's the captain and the leader.