Mesut Ozil has slammed Chelsea for letting one of his former team-mates leave the club.
The former Arsenal playmaker scored 33 goals in 184 appearances for the Gunners and boasts a number of top trophies to his name including the World Cup.
Taking aim on social media, the 35-year-old claimed it was a huge mistake for the Blues to let his former international team-mate Antonio Rudiger join Real Madrid.
The Spanish giant is currently top of La Liga after they beat Mallorca 1-0 on Wednesday thanks to a goal from Rudiger.