It was the first opening-game defeat for a host nation in the history of the World Cup when Enner Valencia scored a pair of goals in the 2-0 win over Qatar.
Valencia scored an early penalty and added a well-taken 31st-minute headed goal to give the South Americans a commanding first-half lead as the Qatars looked overcome by the significance of the occasion.
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"Obviously this wasn't what we were hoping for," said Felixnchez.
I want to wish our opponents good luck. There is a lot of work that needs to be done.
We did not play to our full potential. The responsibilities and nerves may have gotten the better of us. We have to forget about it and be more competative. We're able to do it.
It could have been worse for the hosts in front of 67,372 fans at the Al Bayt Stadium had Valencia's third-minute goal not been ruled out for a marginal offside.
Valencia was tripped by al-Sheeb when he was through on goal and then he calmly dispatched the resulting penalty in the 16th minute.
This will be like no other, says the opener.
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