Son Heung-min admitted talk was cheap after Tottenham were routed at Leicester.
The Foxes thumped Spurs 4-1 in the Premier League on Saturday in a damaging blow to their Champions League hopes.
Rodrigo Bentancur grabbed a first-half opener but goals from Nampalys Mendy, James Maddison, Kelechi Iheanacho and Harvey Barnes left Tottenham fifth in the Premier League.
Spurs go to AC Milan for the first leg of their Champions League last-16 tie on Tuesday and Son knows actions speak louder than words.
'I wouldn't say we are confident, but words are not enough.