The Argentine attacker was lost for words after his side's tragic exit in the semi-finals of the Europa League
Valencia were only seconds away from reaching the showpiece in Turin after taking a 3-0 lead in the second-leg against Sevilla, putting them 3-2 up on aggregate late on.
However, a 94th-minute goal from Stephane M'Bia was enough to see Sevilla through on away goals after their 2-0 win in the first-leg.
"I have no words," Piatti told reporters. "We feel very bad and we are very hurt.
"We tried, we gave everything and they scored against us in the last minute.
"We are pleased with the work we have done, but it didn't amount to anything in the end.
"I want to thank everyone who came to support us."
Valencia's drought in European finals continues, with their last appearance in a Uefa club competition decider back in 2004 when they upstaged Marseille to claim the Uefa Cup.