However, he believes that by putting in the hard yards, he can recover the form he showed last term.
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Estupinan told TV reporters while on international duty with Ecuador: "I'm struggling, I've had problems with my ankle.
I'll try to go back and see what to do to be 100%.
I have wanted to be with the national team, to fight for it, but there are no excuses.
"I try to give my all and I will continue working."