Kane, who scored 21 goals in the Premier League last season, has found the target six times in the league so far this term.
Former Tottenham defender Roberts has also urged Mousa Dembele, Dele Alli, Kane, Christian Eriksen, Kyle Walker, Jan Vertonghen and Toby Alderweireld to do their best to win against West Ham United on Sunday.
Backing @HKane to hit 20 prem goals again on at the moment.— Graham Roberts (@GrahamRoberts4) November 20, 2015
Tottenham will be looking to return to winning ways in the Premier League when they take on London rivals West Ham at White Hart Lane.
Spurs will have home advantage, but the Hammers are a good team and are also in the running for a top-four finish in the league this season.
Both Tottenham and West Ham have picked up 21 points from 12 Premier League games so far this campaign.