After flying to Manchester on board a private jet and visiting Carrington, Sanchez was also at Old Trafford on Sunday to film segments for his unveiling while wearing United's No. 7 shirt.
Alexis Sanchez is nearly certainly going to pass his medical at Manchester United, the Chilean global has been fit this term, and was playing well during the early stages of the season.More news: Gas prices down a dime
United hijacked the bid from Manchester City with a more lucrative offer for the Chilean, but Wenger admitted that he "cannot understand" the 29-year-old's desire to leave the Emirates Stadium.
Wenger says he "cannot understand" the decision of a player to leave the Emirates Stadium but believes the money on offer ultimately proved too tempting for the Chile worldwide, who was in the last six months of his Gunners deal. A run of questionable results and the very likely sale of Alexis Sanchez to Manchester United had left the fans disgruntled.
Wenger said: "Sanchez will only happen if Mkhitaryan comes".
"I think it's so close, so close that if it doesn't happen it's not going to happen, so I am positive".More news: Chelsea Agree Potential Move For Former City Striker
"Alexis is one of the best attacking players in the world and he will complete our very young and talented group of attacking players", he said. "If you want to have a bet, I'd say it could happen". That tells you we had no chance to give him a contract. "I just play the good players".
"I expect soon or never", Mourinho said after his side's 1-0 win against Burnley.
He is acutely aware of the kind of figures that now appear to be considered acceptable by United in terms of wages for their best players.
Arsenal hope the deal will go through in the next few days and they will then press ahead with their pursuit of Borussia Dortmund's Pierre-Emerick Aubameyang with the German club wanting Olivier Giroud as part of the deal.More news: Serial stowaway Marilyn Hartman flies to London, sent back and arrested