Takehiro Tomiyasu, a Japanese international, has joined Arsenal from Bologna for £19.8 million. The 22-year-old can play right-back or center-back and is a great passer. After Ben White and Nuno Tavares, this is Arsenal’s third defender in this window. Mikel Arteta will be hopeful that his arrival would provide a much-needed lift to his team. This season, they’ve already given up nine goals in three Premier League games.