Steven Naismith believes Romelu Lukaku will have a point to prove when Everton's record signing faces his former club Chelsea for the first time on Saturday.
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Lukaku, who left Stamford Bridge this summer in a deal worth 28 million pounds, never scored for Chelsea and was only granted one league start during his time at the club.
The Belgium international had been on loan at West Brom and Everton during the previous two seasons and was ineligible to face his parent club.
However, he is set to face Jose Mourinho's side at Goodison Park at the weekend, and teammate Naismith said: "I am sure there will be things he wants to prove to Chelsea."
He added: "It was a big-money move to come here so I don't think he was a disappointment at Chelsea. There was a lot of quality players ahead of him at the time so we are just lucky we have him and hopefully next week he will have a good performance and really turn it on against them."
Lukaku, 21, set up Naismith's goal in Saturday's 2-2 draw against Arsenal and the Scot is convinced his colleague has the ability to become a high-class player.
He said: "He is good. He works hard for the team. He is a young guy with a massive amount of potential -- I have even noticed a difference from last season and that is only going to continue over the coming years, so I am sure when he gets to his mid-20s he will be one of Europe's best strikers."
Everton manager Roberto Martinez revealed that Lukaku played against Arsenal despite struggling with injury, but expects his biggest buy to fit to face Chelsea.
He said in his news conference on Saturday: "Romelu has done incredible to last for 70 or 75 minutes. He has got a knock in his toe. I am extremely proud of his attitude. He was immense for so long. I will be very surprised if he is not fit for Saturday."