Roberto Martinez will continue to monitor Seamus Coleman over the next 24 hours to assess the severity of the full-back’s hamstring problem.
Coleman limped off during the second half of Monday’s 1-1 draw with West Bromwich Albion.
Martinez provided an update to evertontv on Tuesday morning.
He said: “The next 24 hours are going to be vital to find out how he feels and the extent of the injury.
"Seamus is a really fit boy, so when he has that feeling that something is wrong with his hamstring, we need to take that seriously."
The Everton boss also revealed that Steven Pienaar missed the game at the Hawthorns with a groin problem picked up against Norwich City 10 days ago.
He continued: “Steven had to come off in the last home game and since then he has been working really hard to get back to full fitness.
"He was a little bit short of that on Monday and we'll assess him over the next few days. It's too early to tell but it shouldn't be too big of a problem."
With trips to Stevenage and Liverpool next up, the Blues return to action at Goodison on 1 February against Aston Villa. Tickets are on sale now here.
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