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Everton are sweating over the fitness of Richarlison for the weekend trip to Chelsea.

The Brazilian missed training on Thursday and only took part in a light individual session on Friday ahead of Sunday's clash of Stamford Bridge.

The 21-year-old has been a revelation since arriving from Watford, and has already beaten last season's goalscoring tally with six goals for the Blues so far this season.

But he is a doubt to lead the line against Chelsea, although Everton boss Marco Silva insists he has confidence in whoever might be required to replace him.

"He didn't do all the session today, semi-individual work," he said. "We will see tomorrow, we have one more session, but he is still a doubt for the match.

"Nothing changed yesterday for today, let's see how he reacts after the semi-individual work he did this morning.

We know he's important for us as a striker, or outside as a winger, he's important for us of course. If he's not fit, it's a good opportunity for another player.

Richarlison delights with his pigeon dance

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"This is football, if you have a problem then you look for a solution as well. The players who are waiting for their chance, they have all my confidence."

On the impact Richarlison has made so far, Silva added: "The club did a big effort to sign him. Since the first moment he came and joined us, I didn't have doubts he would settle and fit in our club.

"Not just because he can score as a striker or winger, but how he works and has a connection with the fans. He is a fighter, and he never gives up."

Silva would also not be drawn on whether Yerry Mina will be handed his full Premier League debut against the West London side.

Loanee Kurt Zouma is ineligible against his parent club, enforcing a change from the usual centre-back partnership between the Frenchman and Michael Keane.

Mina earned his first start at Goodison on Tuesday in the SportPesa Cup final victory over Kenyan side Gor Mahia, but the Portuguese boss would not confirm it was enough to see him retain his place.

"Like Richarlison, we have one more session tomorrow. Our players will know some hours before the match. It's something we are working on, to prepare for the match.

"He (Mina) will bring his quality, like Zouma is doing, like Michael or the other central defenders.

"He's a little bit different to Zouma as a profile but for sure he will bring his quality to the squad."

Jonjoe Kenny remains a doubt for the game against Chelsea, but Phil Jagielka and James McCarthy have been passed fit.