Osasuna boss Jose Luis Mendilibar was angry with his side after they lost 2-1 to Real Betis on Friday evening.
Despite pulling a goal back late in the second half through Francisco Silva, the Rojillos let a point slip from their grasp as the hosts scored a 79th minute winner.
And the 51-year-old has admitted that his men made mistakes in the defeat.
“My assessment of the game is not positive,” he told a Press conference. “We have fallen here this evening.
“Their goals were completely our fault.
“We should have been more attentive – it was our fault.
“I think we dominated in the second half, but we can't continue to give the ball away like we have here.”