Arsenal look set to strengthen their midfield this summer, and reports indicate that a move for Mikel Merino is in the works. If Arsenal can agree a deal with Real Sociedad for Merino, they will be adding an experienced player capable of attacking the box whilst bringing physicality to the middle of the park. Merino’s best position is perhaps in a box-to-box role, which was occupied by Declan Rice in the second half of last season. There is also a case to be made that if Thomas Partey departs, after another year of injury struggle, another number six could be a useful addition. Arsenal have be…