Jose Mourinho didn't include the attacking midfielder in his starting line-up for nearly two months before the playmaker returned to the Manchester United team for a goalless draw with Southampton on Boxing Day.
Speaking of Sanchez ahead of Monday's Premier League match against Stoke City, Mourinho said: 'I don't know if ethical or correct. With that in mind, Arsenal supporters will be clinging to some slender hope that the 29-year-old may yet extend his stay at the Emirates Stadium.
The World Cup victor has openly called for marquee signings in the past, and Wenger admitted that Arsenal's ability to fight for trophies could be just as important as the player's salary.
However, recent reports suggested that Jose Mourinho's side were looking to hijack a potential deal for the Chilean forward with a £25m ($34m) bid as Gunners boss Arsene Wenger seems resigned to losing his key man.
Sanchez has been linked with a shock move to Old Trafford since the midweek when it emerged United had reportedly bid £25m for the Chile worldwide.
"If someone speaks of one of my players to say they are interested or not interested I would not be very happy".
Predicted Arsenal XI vs Bournemouth
The United manager has complained recently about his lack of spending power compared to City but last night he moved quickly to assure executive vice-chairman Ed Woodward that he would not be greedy and demand more marquee signings in the summer should they land Sanchez.
"I think when a person insults another, you can expect a response or you can expect contempt, silence", Mourinho said.
United would have no problem in meeting Arsenal's demands and similarly would have no qualms paying the agent's fee having handed Mino Raiola £41m when they secured the then world record purchase of Paul Pogba.
"I don't question his passion when he's on the pitch, he wants to win, ' Wenger further added".
"Is he [Sanchez] replaceable in the way that we find exactly the same player? He'll have the choice of a lot of clubs and, if United could get him, it would be a massive signing".
If Sanchez ends up staying at Arsenal this month, which is very possible, City will fancy their chances of landing him on a free transfer at the end of the season.
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