Luiz Adriano, Brazilian striker representing Shakhtar Donetsk, has showered praise on Yussuf Ayila, who recently joined Metalist for the remainder of this season. <br /><br />The Brazilian striker has stated that the Nigerian is the best defender he has faced in the Ukrainian championship.<br /><br />The 26 - year - old told dynamomania.com : &ldquo;Against whom I encountered the most difficulty? This is Ayila Yussuf. Very tenacious player .<br /><br />&ldquo;I have not heard that he has moved to Metalist. That is news to me. &rdquo;<br /><br />Luiz Adriano has notched up 8 goals in 14 matches so far this season for the Ukrainian champions.<br /><br />Photo Credit : fcdynamo.kiev.ua.<br /><br /><br />