"We have the skills necessary to be the better team. In our last game we were overconfident and didn't work hard enough," Flores said about the former Spanish champions 3-2 defeat to Celta Vigo.

"We must recover these attributes against Shakhtar," he said. "We need to return to playing in a tight, disciplined manner so that the match cannot be decided by a chance moment."

Valencia currently hold top spot in their Group D after two games, three points clear of second place AS Roma.

"Our primary objective is to qualify for the second round, but after that it is to finish top of the group. That will be easier to achieve if we earn a third win in three games," added Flores.