The Red Devils head to the Bet365 Stadium for the late kick off (5.30pm) looking to maintain their 100 per cent record this season.
They sit proudly at the top of the Premier League after three games but could be undercooked due to the recent international break.
With Mourinho's squad flying back from all corners of the globe he doesn’t have much time to get them up to speed for today's encounter.
And yesterday's training session will have been the only chance the Portuguese had to evaluate who is, and is not, ready to play this evening.
Last night Mourinho told MUTV: "Who's fit? We have to wait and see.
"There is still one more training session.
"Not every player has reported yet, so today is the first time we are all together.
"I hope that these 15 days without us being together and working together, doesn't affect us too much.
"I know it will affect [us].
"I know that one thing is a week working with the players and working tactically and going through every principle of play to be ready for the weekend match; another thing is to have the players away and arriving step by step.
"I don't even see them all.
"Today is the first time I see them all together, and obviously today is not a day to work; today is just a day to make the decision and the selection and to travel to Stoke.
"But hopefully, we can keep a good level of play."
