Manchester United manager Sir Alex Ferguson has warned his players there will be no room for complacency this season.
United won both the Premier League and Champions League last term but Ferguson now wants his squad to knuckle down to the new campaign.
He insists he will not be afraid to move players on if he feels they are not showing the hunger he expects.
The Scot said: 'If success has gone to anyone's head and they show signs they are ready to rest on their laurels, they will soon be on their way.
'Soon I will look into the eyes of my players to make sure they have retained the hunger they need to succeed. Then we will look forward.
'If I don't see the appetite and ambition, then the bus moves on without anyone who has lost the spark.'
Meanwhile, Captain Gary Neville is confident he can re-establish himself in team this season despite another injury setback.
The 33-year-old has made only one first-team appearance since last March after a serious ankle injury while he has also been dogged by calf problems.
A calf strain has ruled him out of Ole Gunnar Solskjaer's testimonial on Saturday, although manager Sir Alex Ferguson is hopeful he will be fit to face Juventus on Wednesday.
'I genuinely believe, in my heart of hearts, with the way that I felt at the end of last season, that I will come back this season,' Neville told the Times.
'I've trained through the summer and I genuinely feel I'll be fine, but until you've gone out there and done it, it means nothing.
'I've got to go and do the very best I can to (stay) at Manchester United because that's the only place where I really want to play football,' added Neville, whose contract expires next summer.
'Hopefully I can keep (retirement) at bay for another couple of years or so.'