"This action is added to the video of congratulation for the Chinese New Year that was made by the club and released this Monday, with the participation of first team players Leo Messi, Gerard Pique, Marc-Andre ter Stegen and Samuel Umtiti", said the statement.
Real coach Santiago Solari said the uncertainty wasn't affecting his team's preparations.
"At the Camp Nou, Real Madrid usually play good games and although in the league game we were superior and they were in a delicate emotional moment, we expect Madrid to be at their best". "If Messi is fit he'll play and if he isn't in shape, he won't", commented Valverde. Barca have indicated they will not risk their captain with a gruelling month ahead.
Messi has been in typically imperious form this season, netting almost 30 goals in all competitions but Valverde says that Barcelona have enough firepower in their arsenal to overcome Real Madrid even if their captain isn't on the field.
Barcelona are now eight points ahead of Real at the top of the league table.
Isco has instead had to settle for starts in cup competitions and cameo appearances from the bench in the Spanish top flight, leading to rumours that he will be on his way out in the summer.More news: Oscars to go without host for first time in 30 years
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Messi was out with a broken arm the last time Spain's two biggest clubs met back in October.
"Vinicius delights and plays better at the Bernabéu".
Solari meanwhile has practically a full squad at his disposal, with only little-used defender Jesus Vallejo unavailable. "It's one of the hardest parts of the job for a coach".
Barca's French forward Ousmane Dembele is unlikely to be fit for the game, as he is still recovering from a hamstring injury.
"If it was the last match tomorrow, than it would be different", he said. The French striker has 18 goals, six more than he had in all of last season.
Real Madrid will deploy Keylor Navas in goal after the former no 1 overcame a hip injury and should replace Thibaut Courtois in the playing eleven.