Cardiff entered the contest in confident mood after four points from festive fixtures at Crystal Palace and Leicester had moved them three clear of the relegation zone.
Pochettino admitted after Saturday's loss that fatigue had been an issue, so he had a decision to make here against Cardiff three days later: pick the same familiar faces once again or ring the changes and introduce fresher squad men such as 18-year-old midfielder Oliver Skipp.
The result means Mauricio Pochettino's Tottenham side sit a point ahead of Manchester City and six behind Liverpool, who both meet each other on Thursday night. There was just one change from the lineup selected against Wolves, with Danny Rose replacing Ben Davies at left-back. Kieran Trippier with the ball in, it comes off Kane's thigh, bounces back off the defender, back onto Kane and rolls into the net.
'Us and Everton, we were the two teams who suffered the most hard fixtures in that period, ' Pochettino said after Tottenham's fourth game in 10 days.
Kane filled the number 10 position again to free the in-form Son, who easily evaded the attention of Morrison to fire home his eighth goal in nine games. "I think they should enforce it".
Though Sissoko is yet to score in the league this season, he has provided the energy in midfield which has earned him the adulation of the fans.
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Spurs made it 2-0 after just 12 minutes with a classy goal from Eriksen.
These clashes against top-six sides probably won't define the Bluebirds' season and decide their fate in the relegation battle.
Tottenham Hotspur legend Graham Roberts has lauded Moussa Sissoko's performance against Cardiff on Tuesday and believes the Frenchman is "bossing" it in midfield this season.
Warnock, whose Cardiff lost 3-0 at home to Spurs on Tuesday having suffered defeat at Wembley earlier in the season, said: "The league should enforce they play at Wembley now for the rest of the season".