Arsenal are in the market for a central midfielder, and a previous target of theirs is now available on a free transfer. Mikel Arteta is keen on adding another option alongside Declan Rice and Martin Odegaard, with Mikel Merino the latest name linked. Arsenal want to complete their midfield trio, and by targeting Merino, it is clear that they are willing to deviate from their policy of targeting younger players. A player who has been continually linked with Arsenal for the best part of a decade is World Cup winner Adrien Rabiot, and the 29-year-old is now a free agent after leaving Juventus. F…