The Spanish international has started against Juventus in the first leg of their last 16 Champions League clashes.
And Costa was booked in the eighth minute in Madrid, which means he will miss the second leg in Turin.
The star of Atletico was then fortunate not to be sent back for a dive that VAR canceled.
But Chelsea fans were still impressed by Costa for presenting a controversial exhibit.
One of them said: "It is very painful to watch Diego Costa hurry for Athleti … it should be us @ChelseaFC #AtletiJuve"
Another added: "I miss Diego Costa Chelsea."
"Diego Costa in Chelsea I miss him, what absolute boredom he is against the defenders," explained a third.
And a fourth said: "I miss Diego Costa in Chelsea …"
Costa had booked early so as not to retreat into the wall.
And the 30-year-old had the chance to stay after appearing to dive to try to win a penalty.
Chelsea fans still want the striker to come back, but Maurizio Sarri is under intense pressure.
Gonzalo Higuain and Olivier Giroud are their usual options.
Costa has been in a decent form this season, scoring four goals in just 16 appearances.
Atletico will absolutely want the attacker to keep a cool head and remain on the field against Cristiano Ronaldo.
The other match of the Champions League tonight will take place between Manchester City, Premier League champion, against Schalke.