The Brazilian striker made a £32million switch to Stamford Bridge this summer after seven seasons in the Spanish capital.
And while Costa is thought to be loving life in London after guiding the Blues to the top of the Premier League, he couldn't resist the opportunity to drop in on some old friends.
Indeed, Costa looked relaxed as he attended Atletico training ahead of their La Liga clash with Valencia tomorrow.
GETTY
Diego Costa lifted the Capital One Cup last week
Today, @diegocosta visited us. The international greeted his friends and former teammates from our team.
Atletico Madrid Twitter feed
A post on Atletico Madrid's official Twitter feed said: "Today, @diegocosta visited us. The international greeted his friends and former teammates from our team."
Costa - along with the rest of the Chelsea squad - has been given some time off by Jose Mourinho after triumphing in the Capital One Cup last Sunday and seeing off West Ham in midweek.
The Blues will not now return to action until March 15 when they face Southampton in the Premier League before hosting Paris Saint-Germain in the Champions League the following week.
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