Diego Simeone decided it was best for Diego Costa to stay away from tonights Champions League clash.
Costa left Chelsea in September following a breakdown in relations with head coach Antonio Conte and returned to Atleti, having departed to join the Premier League champions in 2014.
The Spain international is not eligible to make his second Atletico debut until January and Simeone opted to avoid the potential distraction of Costa returning to his old stomping ground.
Asked why the 29-year-old had not travelled to the London, Simeone told a pre-match news conference: “Because I am the manager. I made the best decision what I think was best for the team.
Costa was in the stands at the Wanda Metropolitano when Chelsea claimed a brilliant 2-1 away win in the immediate aftermath of his transfer being finalised.
Atletico remained winless in Group C until a spectacular volley from Antoine Griezmann and Kevin Gameiro’s late second saw them beat Roma 2-0 last time out.