Romelu Lukaku's agent Mino Raiola claims a new contract is "99.9 per cent" done but offered no guarantees the striker would stay at Everton long-term.

The Belgium international, whose current deal runs until 2019, is set to become the club's first £100,000-plus-a-week player.

Everton fended off interest for the 23-year-old in the summer but Raiola said a new contract would not prevent him leaving at the end of the season.

"With Everton, we have 99.9 per cent reached terms," he told talkSPORT.

"We are talking to the club in a good spirit so we are very hopeful. 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."

Lukaku joined the Toffees from Chelsea for a club-record £28million in 2014 and has scored 70 goals in 142 appearances, last season becoming the first Everton player since Gary Lineker to score 25 league goals in a single campaign,

That form attracted interest from a number of clubs but Everton were able to resist advances and persuade Lukaku to stay to work under new manager Ronald Koeman.

However, there is likely to be a repeat at the end of this season and Raiola gave no assurances the outcome would be the same.

"If Romelu is good enough, strong enough, to move in the next year then we will talk to Everton about it," he added.

"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.

"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 vs Liverpool player ratings Show all 23 1 /23 Everton vs Liverpool player ratings Everton vs Liverpool player ratings everton-vs-liverpool.jpg Who stood out in the Merseyside derby? Getty Everton vs Liverpool player ratings 1-pickford.jpg Produced a couple of great saves in the first half to deny Dominic Solanke and James Milner. Getty Everton vs Liverpool player ratings 2-coleman.jpg Instigated the game’s first real flash-point as he squared up to Danny Ings after a foul by the Liverpool man. Getty Everton vs Liverpool player ratings 3-jagielka.jpg Produced a couple of full-blooded challenges in the second half that really got the crowd going. Getty Everton vs Liverpool player ratings 4-keane.jpg A solid display in front of the watching Gareth Southgate. Getty Everton vs Liverpool player ratings 5-baines.jpg As dependable as ever on the left side of Everton’s back four and nearly claimed an assist with a dangerous cross late on. Getty Everton vs Liverpool player ratings 6-rooney.jpg Exerted little influence and was lucky to escape a booking for a cynical lunge on Dominic Solanke. Hooked shortly after the break, much to his visible anger. Getty Everton vs Liverpool player ratings 7-schneiderlin.jpg Looked tired in midfield. Getty Everton vs Liverpool player ratings 8-davies.jpg Carved open Liverpool’s defence with a through ball to Baines, whose subsequent cross into the box almost provided the opener 15 minutes from time. Getty Everton vs Liverpool player ratings 9-walcott.jpg Anonymous in the first 75 minutes but was perhaps Everton’s biggest threat in the closing stages. Getty Everton vs Liverpool player ratings 10-tosun.jpg Missed a gilt-edged chance late on as he put his header wide from point-blank range after good work by Theo Walcott. Getty Everton vs Liverpool player ratings 11-bolasie.jpg Almost opened the scoring with a stunning long-distance strike but Loris Karius thwarted him with a superb fingertip stop. Getty Everton vs Liverpool player ratings 12-karius.jpg Came up with one of the saves of the season to deny Bolasie a stunning first-half opener. Getty Everton vs Liverpool player ratings 13-clyne.jpg Another solid outing as he continues his comeback from a serious back injury. Getty Everton vs Liverpool player ratings 14-lovren.jpg Could’ve cost Liverpool the game late on as he got caught the wrong side of Cenk Tosun, which allowed the Everton man a run at goal. Getty Everton vs Liverpool player ratings 15-van-dijk.jpg A commanding presence at the back as always. Getty Everton vs Liverpool player ratings 16-klavan.jpg Almost sliced the ball into his own net from a teasing Everton cross in the first half. Not a left-back. Getty Everton vs Liverpool player ratings 17-wijnaldum.jpg Classy in the centre of the park and could’ve played his way into contention for a starting berth at the Etihad on Tuesday. Getty Everton vs Liverpool player ratings 18-henderson.jpg Will be gutted to be missing next week’s game against City through suspension but he didn’t let his disappointment show today. Getty Everton vs Liverpool player ratings 19-milner.jpg Backed up his European display against City with another solid outing and would have scored were it not for Pickford’s heroic first-half display. Getty Everton vs Liverpool player ratings 20-ings.jpg A decent outing for the injury-plagued attacker but he never threatened Jordan Pickford’s goal. Getty Everton vs Liverpool player ratings 21-solanke.jpg Put an early header wide and should’ve scored a few minutes later when he was denied from close range by Pickford. Getty Everton vs Liverpool player ratings 22-mane.jpg Looked to be playing within himself. Perhaps had one eye on Tuesday night. Getty

Koeman is confident he will receive backing both in terms of finances and time to lift Everton to the level Raiola hopes they can attain.

The Dutchman is keen to revamp the playing staff he inherited from predecessor Roberto Martinez in the summer and will use the next two transfer windows to strengthen, while also moving on players who do not fit into his plans.

Koeman's long-term plans have already started to take shape, with senior players Leighton Baines and Gareth Barry - plus youngster Mason Holgate - signing contract extensions last week and in addition to Lukaku there are plans to begin negotiations with midfielder Ross Barkley early in 2017.

Koeman, backed by billionaire majority shareholder Farhad Moshiri, will spend in January, with Manchester United duo Morgan Schneiderlin and Memphis Depay targets, but he accepts that is only the beginning.

Lukaku in action for Everton in the Meryseyside derby (Getty)

"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," he told Dutch broadcaster NOS.

"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."