6) David Ospina (Arsenal)
Brought in for just £3m, Arsenal have signed a superb goalkeeper in David Ospina, who will likely challenge Wojciech Szczesny for the number one place at the Emirates Stadium. The Colombian international first came onto Arsene Wenger’s radar with his performances for Ligue 1 side Nice, and then finally won him over with his heroics for his national side at this summer’s World Cup.