Barcelona admit that replacing Victor Valdes and Carles Puyol will mean they need to do more than just 'tweak' their squad this summer.
Valdes and Puyol have both confirmed they will be departing the Camp Nou in the summer when their respective deals expire.
The departure of 32-year-old Valdes and 35-year-old Puyol will mark a real turning point for Barca, as they will be the first players to depart from their side which has become one of the most successful in footballing history.
In the last nine years, Barca have won six Spanish league titles, two Spanish cups and three Champions League successes.
"We knew that Victor Valdes wasn't going to stay, now we know that Carles Puyol isn't going to either," said sporting director Andoni Zubizarreta.
"They have been two obvious references in our squad. Just taking these two players into account, I would say that it's already now more than the tweaks we had envisaged."
Zubizarreta has stated that they have already a player lined up to replace Valdes, who has been strongly linked with a move to England.
"I already know the name of the goalkeeper who is going to replace Valdes and he's practically already signed," he told Catalunya Radio.
"We just have to give it a little more time, before we make the announcement."
Whilst Puyol's departure is certain - with a likely move to America or Asia - Real Madrid chief Florentino Perez still feels there is some doubt about Valdes' departure.
"It remains to be seen if Victor Valdes will leave Barcelona, he might not. He hasn't left yet. Yes, he said he would, but we'll just have to wait and see," said Perez.