"The ball did not want to go into the net on Saturday, but football is like that," said the ex-Liverpool striker. "You cannot say that it was a one-off because it happened, but we must continue to work for the game against PSV, which is very important.
"After a defeat, it is best for any player to reach the next match in the shortest possible time."
Sinama-Pongolle also declared confidence in forming a lethal partnership with Argentina striker Sergio Aguero this season.
He added: "I feel very good with Aguero on the field. I think there is an understanding between us."