Everton manager Sean Dyche admits Seamus Coleman's knee injury 'could be serious'.
The Republic of Ireland captain was substituted in last night's 2-all Premier League draw with Leicester.
Dyche says the absence of Coleman in the second half had a significant impact on the game
The point lifted Leicester out of the relegation zone, with Everton still second from bottom.
Tonight, Arsenal can return to the top of the table if they get the better of Chelsea.
Kick off at the Emirates is at 8pm.