Chelsea were able to summon a late charge and equalised when former Manchester City defender Stefan Savic deflected a low drive by Eden Hazard into his own net — and there were plenty of chances for Chelsea to win the game.
Atletico goalkeeper Jan Oblak produced a splendid save to thwart Alvaro Morata and Willian sliced over from the edge of the area when the goal gaped. Michy Batshuayi almost produced a stunning winner in the closing seconds and Hazard, inexplicably, drifted offside when he and Willian had the visitors stretched on another counter-attack.
So, Bakayoko was not the sole culprit and yet his error will loom large at the draw in Switzerland on Monday. It will also be lodged in the mind of owner Roman Abramovich, who was at Stamford Bridge on Tuesday night.
Victory would have secured Chelsea first place in Group C and the relative comfort of top seeding when the ties are pulled out for the last 16, but the draw allowed Roma — who beat Qarabag on Tuesday night — to ease ahead by virtue of their head-to-head results.
Chelsea took only one point from two games against Roma and conceded six goals, a reminder Antonio Conte’s team have plenty of work to do before they are ready to take on the best in Europe.
If Liverpool win Group E, as they are on course to do, it will leave the west Londoners with only three possible opponents in the next round: Paris Saint-Germain, Barcelona and Besiktas. And, with respect to Turkish football, nobody at Chelsea is hoping for a prestige clash with Barcelona or PSG, who ended their interest in the competition in the last two campaigns.