The Basque outfit would move above Sevilla into fifth with three points this evening, but victory for Almeria would move the 19th-place side out of the bottom three.
"There isn't much between top and bottom," Arrasate told reporters at a press conference.
"There'll be no gifts [from Almeria]. We need to be competitive. It'll be a tough match."
Sociedad are currently nine points off the top four.