• Mourinho refuses to rule out deal but says window should be closed • On Arsène Wenger: ‘I never refuse a handshake in a football stadium’

José Mourinho has refused to rule out a new Chelsea bid for Everton’s John Stones, but says he considers the transfer window closed once the season starts.

Mourinho, talking to TalkSport in the build-up to the new Premier League season, also addressed his incident with Arsène Wenger after Sunday’s Community Shield at Wembley, and admitted his concerns over the fitness of his striker Diego Costa.

Asked about Chelsea’s interest in Stones, who is also a target for Manchester United, Mourinho said: “What happens happens, but I won’t lose any time thinking about the transfer window.

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“For me the transfer window is over. I don’t like the transfer window open when the competition starts. I know it is open, I know my club can buy or sell, but I don’t like that feeling. As a coach I am thinking about my players, my squad, and I don’t want to think about transfers. Clubs and players need quiet time and respect when the competition starts.

“Imagine a Swansea player plays against Chelsea on Saturday and then goes to Manchester City, then he plays against Chelsea again the next week. I cannot get that into my head.”

However, after a relatively quiet window for his club so far, Mourinho admitted he was concerned by how much Premier League title rivals had strengthened – and agreed that Costa’s ongoing fitness problems were “a bit of a concern”, suggesting the striker would miss their opening fixture, against Swansea at Stamford Bridge on Saturday.

He said: “He didn’t finish the season and doesn’t start the season, and that doesn’t make me happy. I am not speaking against the boy, the boy is trying hard, but it is not a good feeling for him, and not a good feeling for me.”

On Wenger, who appeared to avoid a handshake with Mourinho after the final whistle at Wembley on Sunday, Mourinho was reflective – making a barbed reference to last season’s clash when he was pushed by the Arsenal manager in a technical area confrontation.

He said: “I think the person is one thing, the manager is one thing; it is one thing on the streets, one thing in the football stadium. In a stadium I never refused a handshake with a rival. Out of respect for my club, respect for football, I never refused a handshake with a manager in a football stadium.

“Last season I had fantastic behaviour on the touchline … I was never sent to the stand. I was [even] pushed in the technical area by another manager and it was a good experience – I kept my emotional control.”

Mourinho also addressed John Terry’s future, saying he did not expect the 34-year-old to play in every league game this season – or to be tempted by a possible international comeback for Euro 2016.

“Nobody can expect him to play every minute of the Premier League season. You cannot expect him to repeat that. But I know he can have a very good season.

“I don’t think he will play for England again, and I don’t think Roy Hodgson will come with that proposal to him. Roy has very good young defenders in the country … and John is not thinking about it. He thinks his time in the national team is over.”

Asked what his dream was for Chelsea’s season as they set about defending the title, Mourinho concluded: “The dream is to beat Swansea [on Saturday], I have no more dreams for the season. We go week after week.

“We are the champions, we play with that gold thing on our shirt. I want the players to feel that way. [But] it is a big challenge for us this season.”