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The 22-year-old midfielder joins on a five-year deal to boost promotion push.
James Maddison's first start in 472 days ended in a draw as Tottenham faced Hoffenheim at Hotspur Way.
Teenage star Mikey Moore scores twice as Tottenham cruise to a 3-0 win.
A muscular Tottenham, powered by £100m Sandro Tonali, swept Hoffenheim aside in front of nearly 55,000 fans.
Tonali and Robertson shine as Tottenham cruise past Hoffenheim in front of 54,345 fans.