"Obviously, stuff is changing and stuff is happening but there were some players that we could have got, that I knew the club could have got, and they didn't get", the 23-year-old said on Wednesday.
Everton host Premier League strugglers Hull on Saturday, and Koeman insisted there is no need for Lukaku to miss out on the game following his interview. "You make decisions at the end of the season, he needs to sign a new contract or else we sell".
The Premier League's joint-leading scorer on 19 goals with Harry Kane, of Tottenham Hotspur, has made no secret of his desire to play in the Champions League and further his blossoming career. "Ross is a boy from Everton and what we need to show to him are the best reasons to stay".
Just how Lukaku's future is played out over the coming months threatens to overshadow the remainder of the season for Everton, who were left reeling by Tuesday's turn of events.
"I don't know what the board's plan is, but there were some players I knew the club could have got and they didn't, and they're playing in this league".
"How this club has to grow, how this club has to improve, which player does it want to bring in so you can challenge for the big trophies".
"Football is a business, you make decisions".
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"I'm not so afraid about the situation because the player has two more years of his contract".
"Of course I am not happy about that interview, because if Everton is not a club with a lot of ambition then I'm not the manager".
Everton stars Romelu Lukaku and Ross Barkley are reportedly top of Chelsea's summer transfer shortlist. Lukaku has refused a new contract at Everton.
"Every player likes to play for titles, in the Champions League; that is a normal ambition", Koeman said.
Dembele joined Celtic on a free transfer from Fulham last summer but could now fetch a transfer fee as high as £40million after his superb debut season in the Scottish Premiership.
"That is what we want as players".
"The team needs Rom, and to score goals Rom needs the team".