Marcos Alonso and Diego Costa began the mind games early as Atletico Madrid and Chelsea prepare to face each other in the last 16 of the Champions League.
Alonso and Costa were team-mates at Stamford Bridge between the summer of 2016 and 2017 as they won the Premier League together under Antonio Conte, while Alonso was born in Madrid and started out his career at Atletico's bitter rivals Real.
On hearing the draw Alonso posted on Instagram: 'Back to my home city soon @championsleague'. Costa replied with the eyes emoji three times and the flame emoji, with Alonso firing back with the 'crying with laughter' emoji and two waving hands.