"Osasuna found two goals pretty quickly. The first was a good set pieces and the second one was a fabulous strike from Armenteros," he told reporters.
"For us it is always a bad time to lose. We are not used to it, we are a winning team. Normally we do not concede a lot of goals, it's been a good first half for Osasuna, and they deserved it.
"We're fine, the only problem is that they have been more successful and we have not had occasion nor confidence to finish them. They deserved to win, but we are physically in good shape."
Atletico welcome Real Madrid to the Calderon next weekend.