Everton boss Roberto Martinez is anxiously waiting to discover the extent of the knee injury suffered by Phil Jagielka at Arsenal on Saturday.
The Toffees captain was forced off 53 minutes into his side's 2-1 defeat to the Gunners after jarring his knee in a challenge with Alex Oxlade-Chamberlain.
Two quick-fire goals from Olivier Giroud Laurent Koscielny in the first half put the hosts in a commanding position, but Ross Barkley halved the deficit just before half-time via a wicked deflection off Gabriel to give the Merseysiders hope.
Martinez conceded the injury to Jagielka looks serious, but is keeping his fingers crossed that the scans will deliver better news.
"Phil Jagielka doesn't complain often so for him to come off it must be an injury," the Spaniard said. "It's probably the biggest negative from today.
"It's too early to tell but it's his right knee and it could be one of a number of structures that are damaged. We'll see what the next 48 hours bring."
Commenting on the result, he added: "We shot ourselves in the foot in terms of giving away such an easy two-goal lead. We put ourselves in a really difficult position but I enjoyed the reaction and the desire to get back [in the game].
"From that point on we had two very important moments in the second half. Petr Cech made a very important save [from Gerard Deulofeu] and there was a great header from Romelu Lukaku that hit the crossbar when it looked like it was going in.
"All in all, to look like you can rescue something from the game after giving away a two-goal lead, it showed what we have in the squad but, from the other side, there is disappointment for giving away such soft goals."