Atletico Madrid coach Diego Simeone says there is no point in dwelling on what might have happened had Chelsea forward Diego Costa returned to the Estadio Vicente Calderon in the summer.
Costa has confirmed that he was keen on a move back to Atletico, whom he left after winning La Liga in 2013-14, but he ultimately remained in London when the clubs failed to agree a deal in the summer.
The Spain international has since been enjoying life under Antonio Conte, with his 14 goals in 18 games helping Chelsea establish a six-point lead at the top of the Premier League.