Romelu Lukaku’s agent, Mino Raiola, has said the striker has agreed “99.9%” of a new contract with Everton but that the player’s future at Goodison Park will be reassessed in the summer.

Everton have been in talks over a contract extension for Lukaku since August and Ronald Koeman last week said deals for the Belgium international and Ross Barkley would be addressed in the new year. Lukaku has two and a half years remaining on the five-year contract he signed when becoming Everton’s record £28m signing in July 2014. His progress as the club’s leading goalscorer, however, will see him rewarded with enhanced and extended terms worth around £100,000 a week.

The 100 best footballers in the world 2016 – interactive Read more

“We are talking to the club in a good spirit so we are very hopeful,” said Raiola, who met Everton’s majority shareholder, Farhad Moshiri, and the chairman, Bill Kenwright, at the Merseyside derby on Monday. “There are no problems on the way that I foresee. I don’t see any big problems. It is a question of putting the details on the paper.”

Raiola, who was speaking to Talksport on Wednesday, has established a good working relationship with Moshiri and Kenwright. A new long-term contract for his client does not necessarily translate into a long-term commitment from a striker who has made no secret of wanting Champions League football.

Everton placed a prohibitive £60m transfer fee on the 23-year-old in the summer, sufficient to ward off interest from his former club Chelsea and keep Lukaku at Goodison for Koeman’s first campaign as manager. The striker has responded with nine goals and three assists but Raiola admits Lukaku’s position will be reviewed at the end of the season.

“With Everton, we have 99.9% reached terms,” the agent said. “If Romelu is good enough, strong enough, to move in the next year then we will talk to Everton about it. It is a very good relationship at the moment. We know what both parties want. Everton is going through a transition from a club that was maybe aiming for Europa League and now they are more ambitious and maybe in the near future will go into the Champions League or maybe even win the Premier League at a certain stage. For sure, it is an interesting club in England.”

Raiola added: “In football, you can’t look too much in front. You need to take it one transfer window at a time. For now, we are agreeing terms and then we will see in the summer what happens and how the situation is. If there is an interest from both parties to move on, then we will talk with the club, but at this point we only have one objective and that is to perform as well as possible for Everton.”

Everton are expected to be active in the January transfer window, with the Manchester United pair Morgan Schneiderlin and Memphis Depay high on the list and Charlton Athletic’s 19-year-old forward Ademola Lookman another target.

Everton made a loss of £24.3m for 2015-16 in accounts posted at the weekend and Moshiri has since provided an £80m interest-free loan. That has been used to pay off other loans totalling £54.8m plus the costs of sacking Roberto Martínez and his backroom staff in mid-contract last season.

Martínez’s successor admits the Everton squad need surgery in the next two transfer windows to achieve the long-term aims. Koeman said: “We know that due to the people we have inside the club that this is a project which is for the long term and it does not mean that you are fighting for trophies within six months of arriving at a new club. We need to invest not only in January but also in the next summer transfer window. I believe that the club are aware of this and that I will receive the time. But it is not easy to get time within football these days.”