Martin Dubravka has been capped 60 times by Slovakia [Getty Images]Tottenham have agreed a deal to sign goalkeeper Martin Dubravka on a free transfer when his contract with Burnley expires on 1 July.The 37-year-old, who had previous spells at Newcastle United and Manchester Untied, played 35 times for the Clarets in the Premier League last season.The Slovakian is Roberto de Zerbi's fourth summer signing after defenders Marcos Senesi and Andy Robertson joined on free transfers, with the Netherlan