Tottenham manager Antonio Conte has fired a warning to out-of-form forward Son Heung-min to leave the forward sweating on his place against Sporting on Tuesday night.
Son has started in all seven of Spurs' matches so far this season, but is yet to find the back of the net despite the club's unbeaten start to the campaign.
His form is a far cry from last season, when Son won the Premier League Golden Boot following a prolific season that heralded 28 goals for club and country in all competitions.