Girona host Barca on Sunday.
Having played for Barça and then coached the club's B team, Eusebio knows a lot about the Catalan club's playing style.
"Having a coach like Eusebio, who knows our philosophy in detail, is an advantage for them," Valverde said in a press conference on Saturday.
Girona lost 6-1 at Camp Nou earlier this year under Pablo Machin but Valverde expects a different game when the two teams meet on Sunday.
"I don't remember a lot about last season's game but I have the feeling that they maybe played a little high and left space behind and we were able to take advantage of that," he added.
"Perhaps, this time they will play a bit deeper. There has been a change (in management) … I don't remember loads about last year's game, but maybe they left space. But they came in good form and it's the same again this year."