The Icelandic centre-half came off with a groin injury during the 3-3 draw at Crystal Palace on Saturday and is set to miss out on the fifth-round clash at Goodison Park.
Alex Pearce remains sidelined with his thigh strain so former Blackburn man Zurab Khizanishvili is in line to start.
Right-back Andy Griffin missed out at the weekend with an Achilles injury, meaning Shaun Cummings will deputise once more.
Goalkeeper Adam Federici remains out with a knee injury so 21-year-old Alex McCarthy will continue fresh from saving a penalty against Palace.
Striker Mathieu Manset is a doubt with a calf injury but top scorer Shane Long is fit to lead the line and will hope to emulate his winning goal across Stanley Park at Anfield in last season's FA Cup run.
Source: PA
Source: PA