If he's operating in a pony league how can we gauge how good he is? That's the point.
Maybe his 14 International caps, his 11 Champions League appearances (that's not including his 6 Champions League qualification games) or his 26 Europa League appearances?
That's over 50 games at the a pretty high level regardless of his domestic league.
I'm not saying he's a great signing cos I personally don't know enough about him, but you can't just rubbish his league and says he's not good enough based on that. He's clearly got something.