Soldado sent Valencia in the lead, but a goal from Schalke striker Raul secured a draw for the Bundesliga side.
“We knew they [Schalke] were dangerous and had top-quality players,” Soldado told Eurosport.
“Someone like Raul knows exactly what he is doing at every moment of the match.
“We expected a better result, but we are an ambitious club and wanted to do much better.”