The Belgium worldwide leads the way in the Premier League scoring charts this season with 24 goals - five more than Chelsea's leading marksman.
Everton have no fresh injury concerns but are boosted by the return of Enner Valencia, who is back in the squad after being ineligible to face his parent club West Ham last weekend.
And Conte said: "I think that, in this league, two teams are having a great season. But you know that in football there is also the will of the player, who I think is happy to stay".
Speaking at a press conference to preview Sunday's Premier League game against Chelsea, Koeman added: "We like to keep the best players but we know that it is hard".
"I think that in this part of the season each game is very tough for many different reasons".
On the subject of Costa's future, Conte was tight lipped, with rumours continuing to circulate about his future in London, "I continue to be focused on this moment and I'm reading a lot of speculation about all of us".
"Nobody ever asked me to compare this possible victory to those at Juve", Conte fumed in an interview with Sky.
"But I think, also Eden is very happy to stay in Chelsea, to stay with us and work with us. Yes". And I think that Eden is starting to do this step.
King Arthur fights back to big screen, leading the resistance
Meanwhile, the star has also revealed that he used a sit-down chat to convince Ritchie to let him audition for King Arthur . Ritchie's creative style would be a fantastic fit for the franchise, but unfortunately it doesn't look like it will happen.
"It's an important target for the club, for the fans, for the players and we are very close to reaching that target".
It has been a big week for the ladder leaders, who defeated Tottenham Hotspur 4-2 to qualify for the FA Cup final and moved seven points clear at the top of the league table with their win over the Saints. But not only for Eden, but for every single player. I repeat: we've worked a lot to arrive at this point fighting for the title.
"I think Eden is very happy to stay with us, to work with us", said Conte.
Hazard has been an ever-present for Conte, only missing two league matches due to injury, and is playing an instrumental role in the club winning a fifth championship.
He said: 'It's important to know that I don't like it.
"Our last game of the season is Arsenal away and we still have the possibility to catch them".
The Italian, however, refused to get bogged down focusing on Lukaku, adding: "For sure we have to pay great attention to Lukaku, and the other players, because they have a lot of other players with good technique".
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