Andy Robertson is set to captain Scotland during their first World Cup campaign since 1998 [Getty Images]Tottenham have signed Scotland captain Andy Robertson on a free transfer following his departure from Liverpool.The 32-year-old left-back, who had already announced he would leave the Reds when his contract expired this summer, will become a Spurs player on 1 July. Tottenham, then managed by Thomas Frank, targeted Robertson during the January transfer window. A deal was agreed between the two