Mart Poom knows all about the goalkeeping standards required at Arsenal, having been part of the club’s squad during a memorable era when Jens Lehmann and Manuel Almunia were battling it out for the number one shirt. The former Estonia international, who served as the Gunners’ third-choice goalkeeper between 2005 and 2007, witnessed first-hand the fierce competition between the German and the Spaniard, larger-than-life personalities and occasional fireworks behind the scenes