Spurs boss Mauricio Pochettino joined his opposite number Maurizio Sarri in criticising the use of the Video Assistant Referee (VAR) despite profiting from such a call in Tuesday's Carabao Cup win.
Harry Kane gave Tottenham a slender advantage to take into the second leg at Stamford Bridge in two weeks' time after he dispatched a 26th-minute penalty.
The England captain was brought down by Chelsea goalkeeper Kepa Arrizabalaga, but only after the linesman had flagged for offside.
Editors' Picks
Referee Michael Oliver consulted his video assistant, whose pictures showed Kane to be level with Cesar Azpilicueta, and proceeded to book Kepa and award the spot kick.