Midfielder Darren Fletcher believes he will feel the benefits of Manchester United's tough four-day training camp this season.
The 26-year-old says he worked up a sweat while training in hot conditions in Chicago this week, but is looking forward to United's first pre-season friendly against Celtic on Friday.
"We are excited about the game as we have completed 10 days of pre-season training. Being Scottish, Celtic is an interesting match for me," said Fletcher.
"Training has been difficult but I am sure we will feel the benefits once the season gets under way.
"It was hot enough in Manchester but the heat and humidity in Chicago was something else. It takes a little bit more out of you in training.
"But it is good preparation for what lies ahead and it was great visiting Chicago."
United's travel plans were disrupted after bad weather prevented the party from leaving the city.
Manager Sir Alex Ferguson was unaffected by the disturbance as he departed Chicago early to attend a private dinner in Toronto.
Fletcher believes the boss will make full use of his 22-man squad against the Hoops, given it is their first match.
"You have to be careful as you are not accustomed to playing 90 minutes as your body has had a rest," he added.
"So I would not be surprised to see the minutes managed by the coaching staff. I can see players perhaps playing 60 minutes or half a game with a lot of changes. It means everyone will get a fair share of playing time."