Barca booked their spot in the final after a 4-0 win over Asian champions Al Saad on Thursday, with goals coming from Seydou Keita, Maxwell and a brace from Adriano.
However, the victory was tarnished by an injury to striker David Villa, later revealed be a broken leg which will keep the Spain international out for up to five months.
Nonetheless, Valdes is excited ahead of Sunday's match against Santos, who won their semi-final encounter gainst Kashiwa Reysol 3-1.
"It is the final everybody expected," Valdes said on Barca's official website. "[Both] teams have very similar qualities, and styles as well.
"It will be a thrilling final, with lots of goalscoring chances for both teams."
The threat Santos will pose on Sunday will largely come from wonderkid Neymar, who is currently one of the hottest properties in world football, something Valdes is aware of.
"He [Neymar] is an important player.
"He has so much talent, so it will be important to analyse him and be careful with their attacking moves."
Valdes also dedicated the victory over Al Sadd to his fallen team-mate Villa.
"[It is] bad news on a day that should have been special and historic," Valdes added.
"I dedicate the win to him and we'll try to dedicate a win in the final to him as well."
Following Sunday's match, Barcelona are next in action on December 22 in the second leg of their Copa del Rey tie against L'Hospitalet, their final match before the winter break.