"Over the years, it has been one of the most difficult places to visit," Valverde said at Barcelona's pre-match media conference.

"The last two seasons we have won, but it was on the back of a bad streak.

"If we add to this how La Real are doing – playing good football with great players, and using the last clash here at the Camp Nou as a reference – it will be a tough game.

"They are a team that clearly have a plan, always trying to win the ball back and have a lot of spark."

Valverde intends to take things very much one game at a time.

"We will see what we are going to do from Sunday. We are not thinking beyond Saturday's game," he said, quoted by Marca.

"I don't want us to lose concentration over tomorrow.

"The three points against La Real are worth as much as against Real Madrid."

Full-backs Jordi Alba and Nelson Semedo will be available on Saturday, having not featured in the midweek Champions League win at Inter Milan.

Lionel Messi was rested for the trip to Italy.

The Argentina playmaker is in fine form once again, having scored 14 goals so far.

Sociedad coach Imanol Alguacil accepts his men will have a job on their hands keeping the six-time Ballon d'Or winner quiet.

"There is no way of stopping Messi. The only thing to hope for is that he does not have a good day," Alguacil told a press conference.

"For me, he is the best player that has existed in history, no doubt. Alongside him are players who are not at his level, but who are close."

Sociedad have lost just twice in the past eight LaLiga matches.

"I think we are coming into it in a good way," Alguacil said. "The game has generated a lot of excitement.

"There are no tickets left, the stadium is full – and that says a lot about what the team has transmitted, something which I feel proud about.

"More than the league table and the good performances in some of the games, what excites me most is what we have been able to generate in the fans which has been based around our way of playing."