Nigerian midfielder, Frank Onyeka has joined Premier League newcomers Brentford as their first signing of the summer. The 23-year-old joins from FC Midtjylland for an undisclosed fee. He has already passed a medical and received a work permit after inking a five-year contract in west London.   Bees boss Thomas Frank told the club website: ‘I am looking forward to getting Frank in the building. We think he is a strong addition to the squad, and we are looking …