Diego Reyes:
Already injuries have plagued the Arsenal defence and this has posed some serious threat on their season. Diego Reyes would be able to amend that. The Porto player has not been best for his club in recent times and thus they may want to let go off him. The Mexican is a composed man and shows maturity on field, despite being only 21 years old. Reyes has the talent and the ability to make it big in the Premier League and he can be groomed by the likes of Koscielny, whom he can replace in a few years.