Son shines, Kane hurt as Tottenham strolls into FA Cup semi-finals

London - Heung-Min Son's hat-trick fired Tottenham into the FA Cup semi-finals, but his side's 6-0 victory against Millwall was overshadowed by Harry Kane's potentially serious ankle injury.

Kane limped off in the 10th minute at White Hart Lane after his ankle twisted awkwardly.

The England striker was sidelined with another ankle problem earlier this season and the injury is a major worry for Tottenham boss Mauricio Pochettino.

Tottenham is looking to win the FA Cup for the first time since 1991 and close the gap on Premier League leader Chelsea, but those ambitions would be much harder to achieve without the club's leading scorer.

Despite Kane's absence, Tottenham was too strong for third-tier Millwall, and marked the last FA Cup tie at the Lane before the stadium is demolished, with a commanding quarter-final display.

Christian Eriksen opened the scoring and Dele Alli and Vincent Janssen were also on target, but it was Son who took centre-stage with his treble.

Tottenham will discover its opponent for next month's Wembley semi-finals on Monday, but news of Kane will be anticipated even more eagerly.

Given the notorious reputation of Millwall's support, much of the pre-match focus had been on the possibility of crowd trouble.

There was a tense atmosphere outside the stadium before kick off, but a huge police presence managed to contain the threat of serious violence despite bottle throwing and minor scuffles.

Inside, a large segregated area was used to keep Millwall and Tottenham fans apart, with a line of stewards wearing orange hard hats in case missiles were thrown.