Young Barcelona midfielder Unai Hernández is set to join Saudi Arabian side Al Ittihad in a deal worth an initial €4.5 million ($4.7m), sources have confirmed to ESPN. The 20-year-old will fly to Jeddah this week to finalise the deal, which could pocket Barça a further €500,000 in potential add-ons. Hernández has starred for Barça’s reserve side this season, scoring nine goals in 20 appearances in the third tier of…