The left-back is unhappy at the lack of game time he is receiving under coach Mauricio Pochettino.
Maatsen, who has not even signed a new deal with the club despite months of negotiations, is in hot water.
However, he did appear to add a 'fire emoji' and a 'saluting emoji' in response to Amrabat stating: “Great spirit and great performance! Thanks for the amazing support."
Many fans on social media have said that such a mistake may cause Maatsen to lose his Stamford Bridge career.