Manchester United boss Jose Mourinho has saluted Alexis Sanchez as a "phenomenal" player and did not rule out a potential move for the Arsenal forward.
The Chile international is widely expected to leave the Emirates Stadium this year, and the Red Devils are believed to have joined Manchester United in the race for his signature.
"I don't think it is ethical or correct to be speaking about players of other clubs," Mourinho told reporters when asked about any potential interest in Sanchez.
"If somebody speaks about one of my players, to say we are interested or not I wouldn't be very happy.
"Sanchez is an Arsenal player. I don't know but probably this weekend he is going to wear Arsenal colours. I don't think it is correct to say things about Alexis Sanchez.
"At a general level, what I can say is that myself and the Manchester United board, we do not believe a lot in the January market. We don't believe in signing a player just to do something.
"What we believe is there are some players in the football world where, if you have a chance to sign them, whether it is in January, March or July, then you have to try.
"In relation to Sanchez all I can say, which everyone else says, is that he is a phenomenal player. I feel I shouldn't say much more than this."
Chelsea boss Antonio Conte, meanwhile, said he tried to sign Sanchez while at Juventus, and thinks £20m for the 29-year-old would be a "good investment" and also a bargain.
"He's a great player and he knows very well that in my first season in Juventus we tried to buy him from Udinese and then he decided to go to Udinese," said Conte.
"I have great admiration for great players, I think Alexis Sanchez is one of these players. If Manchester City want Alexis Sanchez, they buy Alexis Sanchez and they don't have problem.
"I think it's a good investment because we are talking about a top player and I'm hearing that the amount is around £20m. If you buy Alexis Sanchez with a normal price maybe 80 or 90 million euros."
- Jose Mourinho
- Antonio Conte
- Manchester United
- Alexis Sanchez
- Manchester City
- Premier League
- Transfer Talk