Contesting Lukaku's claims that Everton lack ambition, the Dutchman said: "Of course I am not happy about this".
"If the player shows his commitment through his football then it's no problem".
Mino Raiola, in facts, want Everton to add a £ 50 million release clause in his client's new deal whilst the Premier League side reckon that the player's minimum transfer fee should be around £ 85 million.
He said: "But I think everybody needs to understand ambitions, and his situation I've tried to explain".
The stand-off between the Belgium global and Everton intensified when he publicly questioned the club's level of ambition following his contract rejection.
"But OK, he is young. he can make mistakes".
Gonzaga vs. South Dakota State live stream, TV channel
Once they did, they never looked back. "It's not going to be easy, and we'll have to meet a lot of challenges". On the season, Gonzaga basketball is averaging 84.6 points, 40.3 rebounds and 16.0 assists per game .
"If we can move on and get in what we want to make the team really strong, I think we can battle with them [the top four], yes".
He started the season displaying unconvincing form, though he has delivered improved displays recently, so much so that he earned himself a recall to the England squad by Gareth Southgate for the Three Lions' March 22 friendly against Germany and March 26 World Cup qualifier against Lithuania.
One of them, 20-year-old Dominic Calvert-Lewin opened the scoring after eight minutes on Saturday with his first Premier League goal - turning in a cross from teenager Tom Davies.
"We know every Premier League game is hard and what happened last week doesn't count any more".
Everton's win lifted them to sixth in the table and level on points - 50 - with fifth-placed Arsenal to keep their hopes of a top-four finish alive.
However Koeman still believes that catching Jose Mourinho's Manchester United, who are in sixth and seven points ahead of Koeman's men, will prove Everton's ambition to join the Premier League's elite. "You can't do it in one".