West Ham United boss Julen Lopetegui is hot on the heels of one attacker in particular this summer. It’s fair to say that Julen Lopetegui needs to strengthen his West Ham squad in pretty much every single department. The Spaniard reportedly has a budget of around £90 million at his disposal this summer, excluding player sales. Despite the fact that Lopetegui needs to strengthen every single position, it could be argued that the addition of a new left winger is by far and away his biggest priority. After Said Benrahma was let go in January, David Moyes failed to replace him, and as a result, we…