Manager Javier Aguirre is already without Adam Pinter and Antonio Tomas due to injury and Maurizio Lanzaro due to suspension, while Zaragoza also cancelled striker Braulio's contract this week.
The Mexican coach's preparation was further disturbed this week as the Latin American trio of Pablo Barrera, Efrain Juarez and Paulo Da Silva did not return from international duty until Friday.
Much was expected of the partnership between Juarez and Barrera down Zaragoza's right side when Aguirre brought both his compatriots on loan after disappointing spells in Britain and, despite improved performances in recent weeks, Barrera says both players know they can do better.
"Aguirre knows us and knows what we are capable of," he said. "We know we can do more and we have to show that on the pitch. Now we are settled we should be able to provide more."
Barrera scored a fine goal on the counter-attack in the 2-2 draw with Villarreal last time out and he admits the goal has been a great boost to his confidence.
"It certainly helped my confidence, I had gone a number of matches without scoring and it was my best moment with Zaragoza so far. Hopefully I can continue in that manner and give more to the team," he added.
Real Sociedad have injury concerns themselves, with Asier Illarramendi and Carlos Vela ruled out of the trip to La Rosaleda, and their preparation for the match has also been disrupted by more claims from winger Antoine Griezmann that he will leave the club next summer.
The France Under-21 internationalist made similar claims this pre-season as he tried to orchestrate a move to Atletico Madrid and manager Philippe Montanier has said the player needs to solely concentrate on his football.
"What is important is what happens on the pitch - football and only football," he said. "He needs to concentrate, think only about what happens on the field and rediscover his best form."