Sanchez is set to join Manchester United on a four-and-a-half-year deal and has agreed to a package worth around £500,000 a week.
But United had hoped to have the deal complete in time for him to play against Burnley tomorrow.
The deadline for that was midday which has now passed and it has emerged some details from the deal are still to be thrashed out.
Henrikh Mkhitaryan pulled into Carrington this morning – using the front entrance, unusual for players as they usually come in through the back – as his future looks uncertain.
The Armenia star is expected to join Arsenal as part of the deal although murmurs of a hold up on his end have emerged today.
The BBC claim Mkhitaryan’s deal is in the balance and ‘could go either way’ after talks stalled.
And now Sanchez has turned up at London Colney where he trained away from the main group yesterday.
He is yet to be spotted on the training pitch yet but it is unlikely he will be with Arsene Wenger’s team as they prepare for Crystal Palace.
He trained with the kids yesterday as he looks to keep up his sharpness ahead of the move.
United had hoped to be able to announce the signing today but that is now looking less likely – although not impossible.
Sanchez will take the No 7 at Old Trafford and adidas have already started selling shirts with his name on in London.
Ed Woodward made signing an iconic superstar to wear the No 7 one of his priorities when he first joined the club and is finally getting his man.
United have also looked at Antoine Griezmann and Paulo Dybala but have swooped in to get Sanchez ahead of rivals Manchester City.
Wenger spoke about the deal further in his press conference yesterday.
He said: ”I’ve worked on transfers for 30 years, so it is likely to happen. It is now in the next 24 to 48 hours that it will happen or not.
“But at any moment, at any minute, things can break down. That’s how the transfer market is.
“As long as it’s not over the line, you have to accept that it can as well not happen. These kind of things are never guaranteed.”
And Mourinho has admitted he doesn’t know where the deal stands.
“I don’t know why it hasn’t happened,” he said.
“My involvement in the situation is just to say that I like him as a player.
“There is nothing new. Everybody knows that we are there.
“Especially when the Arsenal manager speaks so clearly (about Sanchez) like he did.
“There is no point in trying to hide anything.
“But he’s an Arsenal player. I will speak with you if one day we sign him – about what he can bring to the team.
“But at the moment there is no point because he is still an Arsenal player.”
