Former Newcastle United midfielder Mikel Merino is back in the Premier League after completing a move to Arsenal. Six years after leaving Newcastle United, he has returned to England, and is joining Arsenal’s Premier League title charge. Arsenal have been interested in Mikel Merino for a while, and have now completed a deal with Real Sociedad for the 28-year-old. He has cost the Gunners an initial £27.4million, and has signed a four-year deal at the Emirates Stadium. Given how good he was for Newcastle and how much he has improved since then, signing Merino should be a brilliant bit of busines…