@GilbertoSilva," tweeted Piers, which led to the now 44-year-old Gilberto responding "Haha, thank you Piers" along with a praying emoji.But the former defensive midfielder was not done with the debate, and agreed with one fan about keeper Emiliano Martinez before making it clear who felt was Arsenal's biggest unsung hero.Martinez was sold by the Gunners to Aston Villa for £15million last summer, and went on to have an impressive season for Dean Smith's side.One supporter replied to Piers' tweet by saying: "Emi Martinez?
Probably worth triple what the Gooners got for him only a year after he left."Gilberto concurred, saying: "Totally agree with you my friend."Who do you think is Arsenal's most underrated player?
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