Arsenal compiled a dossier of Chelsea striker Diego Costa's 'dirty tricks' in order to have defender Gabriel's red card overturned.
The Brazilian was handed his marching orders by referee Mike Dean during the Gunners' tempestuous 2-0 defeat against Chelsea on Saturday after a clash with Costa, who also had an altercation with Laurent Koscielny.
It was announced yesterday by the FA that Gabriel's red card had been overturned, while Costa has been handed a three-match suspension after he was charged with violent conduct.
Now the Mirror claim to have shed light on Arsenal's attempts to have Gabriel's ban overturned, and say that the club's legal team were able to compile information on Costa and find television footage that showed the defender had made no contact with his Chelsea rival during their clash, despite Costa's protestations that he'd been kicked.
The dossier also contained footage of Costa clashing with Arsenal midfielder Alex Oxlade-Chamberlian, as well as a separate incident with Gabriel.
A statement from Chelsea last night read: 'We are extremely disappointed with the FA Regulatory Commission's decision to suspend Diego Costa. We will await their written reasons before commenting further.'
Gabriel could still be banned because he is facing an improper conduct charge, while Costa will miss the League Cup game at Walsall today, along with Premier League matches against Newcastle and Southampton.