Rossi has scored 14 goals in Serie A this season as Fiorentina have pushed into the top four of Italy's top flight but the 26-year-old striker will miss the next six weeks with knee ligament damage after twisting his right knee in a 1-0 win over Livorno on Sunday.
Valero is Fiorentina's next most prolific goal-scorer in Serie A with five strikes to his name and the Spanish midfielder knows the Florence-based club will have to work hard without Rossi to maintain their position on the league table.
"It's always difficult to do without a player of Giuseppe's level, as we miss him so much, but fortunately we have other champions in the squad and they proved that," Valero said after Fiorentina's 2-0 Coppa Italia victory over Chievo on Wednesday.
"It's positive that we have different options and can take on so many different tactical systems."
It was Fiorentina's fifth win in a row in all competitions.
"This gives us more confidence going into the next games," Valero said ahead of consecutive league trips to Torino and Catania.
