Barcelona have been long-term admirers of Athletic Club's Nico Williams but weren't able to agree deal in last year's summer transfer window.

Barcelona are keen to make a big-name attacking signing this summer, and a shortlist of targets has already been drawn up by sporting director Deco. Luis Diaz, Rafael Leao and Alexander Isak are

Luis Diaz could be the key to Arsenal signing Nico Williams this summer. According to Mundo Deportivo, Diaz is now Barcelona's number one transfer target this summer to strengthen their attack. Barca are in the market for a top-class left winger and Liverpool star Diaz has now moved ahead of previous frontrunner Nico Williams on their shortlist.

Nico Williams remains one of the most coveted players in European football, with both Arsenal and Liverpool having recently made contact regarding a move.

Arsenal’s pursuit of Nico Williams might just get a major boost – thanks to Liverpool’s Luis Díaz.According to Spanish outlet Mundo Deportivo, Barcelona have made the Reds winger their top