Sean Dyche says Dominic Calvert-Lewin is being monitored after being absent from training on Thursday, but the Everton manager has no fresh injury concerns ahead of the trip to Chelsea.
The Blues head to the capital for a Saturday evening kick-off (5.30pm GMT), looking to build on an important 1-0 home victory over Brentford last time out.
Calvert-Lewin, who last appeared for the Toffees in the 1-0 win against Arsenal in Dyche's first game in charge of the Club last month, "felt something" in his rehabilitation from a hamstring issue.
Speaking in his pre-match press conference at Finch Farm, Dyche said:
"We're still monitoring the situation, being careful - [and] he's being careful with his body. We're trying to give him every opportunity.
"He wasn't overly in my thinking for the Chelsea game, regardless of anything else because, obviously, the international break comes and hopefully you can use that even more wisely.
"We're just monitoring his body and he's monitoring it, too.
"He's felt something that we've had to be careful with, that's all. We're trying to get him as strong as he was two years ago and get him back to that statistical level, as well as what we see and how he feels."
When asked if Calvert-Lewin could be ready at the other end of the upcoming international break, Dyche added: "We'll see. There's nothing other than me wanting to get him out there training every day and feeling good about that. That's the best start point and we'll take it from there."
Elsewhere, James Garner, who was an unused substitute in the win over Brentford, and Nathan Patterson continue to build their fitness ahead of making their respective senior return to action.
Andros Townsend (ACL) remains unavailable.